Malicious PDF — malware analysis report

Static analysis result for SHA-256 839a2df2424d595a…

MALICIOUS

PDF

77.1 KB Created: 2021-06-29 23:08:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d44c19ed223e6753aa4dd19b2cf245c7 SHA-1: 1f1726196206298df35d0e0c9dcaf847e420edf1 SHA-256: 839a2df2424d595a3e72f87629492e38379441bf8ce5f4c5892e7ed311da70e9
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which appear to be compromised WordPress installations used for hosting malicious files. The presence of a 'download button' lure and callback phishing indicators further suggest a malicious intent to trick the user into downloading a payload or engaging in a scam. No scripts were extracted, but the overall structure points to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://entone.es/wp-content/plugins/super-forms/uploads/php/files/8fffbfa3d3a655b8ddd1377c18ac63c4/debokivedumovos.pdf In PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608b838fcdd8f---30604938471.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8497740fd---82285767600.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/4af59b417cd590d623a84c9735913e02/40836919628.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/86c135855b12f4b4381d471d583ec684/mudajemawifekaxatuki.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/dopitexajevojuloxisis.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/06e74f1a43fcff7b29b8d366d2d251e7/39221627462.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080876b80e45---6271783572.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/c02d782e339e05fcd8c2226c68c84e9c/famibipemafawig.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/83912467171.pdfIn PDF document text
    • http://cosyromania.com/media/file/zudex.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d1c811533---jarutopisofoji.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/ubkdeedmpu6eedqnjt0iri5m8a/rapotudovemovaj.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/6ba390d6814308ea560e7a1776821319/70198298722.pdfIn PDF document text
    • https://wonkingchina.com/d/files/vanafit.pdfIn PDF document text
    • http://annandale1963.com/clients/69704/File/kuwiwavajiroganizipi.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c5023e59ad8---rubuzufivolizido.pdfIn PDF document text
    • http://beiks.info/public/file/89805310962.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160945e2766b87---82551859276.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/29c25bdb3b85029453d11e15c9a8a98b/2622251920.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/en46dlvltj7r3p47gl438thlu9/nunomixirojuk.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/23fb2818bdc1a923330f6fdede9756de/kuvefis.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/e5a57d6cb2bb165e2b849adef2babde8/53165875154.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d4a6cf117---genunozurow.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/nebel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=phonetics+transcription+exercises+with+answersPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE245 10616 bytes
SHA-256: a8d3fb2f4405768373fa1d3f485fe6dcaf199e47551e9dd0f4946f8212bdba41
font_02_sfnt_off0000fa98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA98 17000 bytes
SHA-256: 02cc3ea212793884aae4a501ac1eaa58ddb77749ac3e47f8a3d96ea84f7dbd80

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