Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d0f2acad2a6e64d…

MALICIOUS

PDF

72.6 KB Created: 2021-09-17 19:17:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e4e6eb0d02072e8c6352a8fe413418f2 SHA-1: 9ad2c6e16ab7bb772085c4b7f0c90a63adc70768 SHA-256: 2d0f2acad2a6e64d20191c6dcb8c043eebfe1ce90f2b4ccad999076e81d47615
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external resources, many of which are hosted on compromised websites or disposable domains, indicating a link farm designed to distribute malicious content. The presence of a 'download button' lure and callback phishing indicators further supports the malicious intent. ClamAV detection and ML classification confirm the malicious nature of the file, likely serving as a downloader for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://nepalmicrofinancesummit.org/userfiles/files/71300444668.pdf In PDF document text
    • http://zavalinka.by/var/upload/file/tufomo.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16136a937e5f9b---37028104176.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/zobozuxaruwogefemaw.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0fd421a40---folufanekera.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/56844379653.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/jaganelise.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/a62cq6bdc19qr34a93phpqm36r/35866679105.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/52469110941.pdfIn PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/dilunopasetasakerezefu.pdfIn PDF document text
    • http://askaudit.ru/price/36476481402.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/pitazofatekopavanutag.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/14899304623.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/79154525376.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7b5736eca---risisosanawukaji.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/98122245191.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e59fe477bd---pifalopepajebire.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/muwosapesufebone.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202109100406558651.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/13738193937.pdfIn PDF document text
    • http://rsst77.ru/upload/files/70375304084.pdfIn PDF document text
    • http://rexant.by/upload/editor/files/20347979735.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1631455231.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=subway+surfers+source+code+free+downloadPDF 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_off0000b924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB924 16644 bytes
SHA-256: b80e780bb47ccf1ef0368a4e81f7e6ad99eac988abaf0f901c6762db444245ca
font_01_sfnt_off0000e3fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FB 10792 bytes
SHA-256: 52f3594e9cb779f66ebf6a559a7f4b3cb02b6cd1714143ed6d6d0150ba887326
font_02_sfnt_off0000fd06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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