Malicious PDF — malware analysis report

Static analysis result for SHA-256 16879ca5d853683f…

MALICIOUS

PDF

84.1 KB Created: 2021-08-14 19:41:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9bb6d74face0e45ea8af4e3fa8b86bec SHA-1: 70f8561fdfb71b29e7be9d70a25cfbd8bdaab6dc SHA-256: 16879ca5d853683f6c4f631809bdec111a83ad29941bc3dd2a4811c1f4e1fba0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan payload. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to host malicious content. The document body is heavily obfuscated, but the presence of PDF-specific heuristics and numerous external URLs strongly suggests an attempt to redirect users to malicious sites, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://archism.ru/uplcv?utm_term=how+to+issue+a+verbal+warning+south+africa PDF link annotation
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107265dd1ece---58503163859.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/zereb.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/70931409094.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16117e9ffd7141---kumewegeka.pdfIn PDF document text
    • https://anfauglir.com/images/file/satamifibadadukebofa.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/66162251161.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d21218883ec---fanizonafuwatutuwobe.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084fe041facb---86222685692.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/javapipiremenotexobosanis.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/jamasavuzed.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/zatifibexoxetulavajoxiko.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/71e88b52dc4c09955ebcff044d479281/muxuboraxipipopaga.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/18574914568.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/g75bp3919e8j5bh0r77icjp96o/61775513598.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/72500784eac8f730d8ff21cee6123ac6/sabitamugeg.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/xevupifiziwobeposi.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a831a893cbf---69079098854.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/b74ef5d2c61a6f51b573d0f332b2711e/gakojolu.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/626a43a2f65065e2769b6b41da78ef0d/luxumogijogafinikexip.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807a196c808---93161707640.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/be8f1654f9746cb99ce47251dcfe843e/64247450136.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16076a96e0b04c---wofokudofazij.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/sedosaforu.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/saxikabunubewu.pdfIn PDF document text
    • 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_off0000e655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE655 16328 bytes
SHA-256: a36e3a6ba6ed3ed145d08e5072bd5023e1a706a9864588322dd0bf123154b0cf
font_01_sfnt_off00011088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11088 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001289f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1289F 11000 bytes
SHA-256: da25323be3c670ebd84f00dbf49280e0b92b812d122b01a2ac249f5750fd76b4

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