Malicious PDF — malware analysis report

Static analysis result for SHA-256 e551998bcaf7a528…

MALICIOUS

PDF

85.1 KB Created: 2021-08-13 11:59:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6dc62b50ab1c2ece8101cfd89aa45b9c SHA-1: b9859dc812fff91fe4c8a9c34b3ba6fef4b1a715 SHA-256: e551998bcaf7a528f7b0f4dda6d308a34f424827caefdb62a08382dd5aa98458
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple links to compromised WordPress sites, indicating an attempt to deliver a malicious payload. The heuristic 'SE_CALLBACK_LURE' suggests a phishing or scam pretext, likely related to job applications given the URL content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6c06191de---peruwerexajulagunuvovel.pdf In PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116199c53a9e---96843194497.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/bfjhrrkdelid3re85ngq4l5d21/97086947761.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/sugepil.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/47259801825.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/74694951681.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/jqga3npik9uvg8pqdhgj8sb58o/14601559642.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/korixefijukax.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ace8cba46---1877369539.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/mipitidepejiturewa.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/29009846025.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/38815269385.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1626095309.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/35985987623.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd03498d0b---redal.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c49a9e42afe---vikelibawojisapulepoveme.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/dofipavawurijunefiwo.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/68017723459.pdfIn PDF document text
    • http://harrisonfamilyreunion.org/clients/868801/File/15170016427.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609647ac9fd1b---56708736383.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8854700ee---jadeta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+apply+at+capitec+for+a+jobPDF 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_off0000e873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE873 17496 bytes
SHA-256: c1278a7ea2904c26ef21ea29b112565e4e05dfeadc632200c396c225333d7d63
font_01_sfnt_off00011658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11658 10660 bytes
SHA-256: cd812f657694e51bd47f46fd5b4be703efc03be696d6e4bb95242cea428a9c32
font_02_sfnt_off00012eb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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