Malicious PDF — malware analysis report

Static analysis result for SHA-256 8efccb53dbbac947…

MALICIOUS

PDF

83.3 KB Created: 2021-09-02 12:01:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fdc53c8f11e226ba954a2199c1aeae12 SHA-1: 4c48d73306ba76e54dd8c27f0387c0d472aa3936 SHA-256: 8efccb53dbbac947f5844da671f4b73113c54b1fa1245f710ba9df7110ec424f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan distribution vehicle. It contains a large number of links, many pointing to compromised WordPress sites and disposable hosting, suggesting it's designed to redirect users to malicious content. The ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • 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://cructi.ru/uplcv?utm_term=ser+and+spanish+speaking+countries+worksheet PDF link annotation
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160fdb41cb5573---fugatim.pdfIn PDF document text
    • http://guitarenko.fr/img/files/sezavenaborilapefezebe.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/fowiwufedagodimosa.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609f91a2e2d14---92200413194.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/tuzaniwovoganasitezuti.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9e0e2b7e9---gozabelapek.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/wuteraduka.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/0b4104a31feebbb8dee36a259bbf7bd1/wupifuxo.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1610367280248c---zixafadude.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/312c0eb50d7f815353ebb859b7c898dd/30751584961.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b5be7ac06---7935131338.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/sevilodiwuvo.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///98040940676.pdfIn PDF document text
    • http://phuclocvienjsc.com/uploads/image/files/14481716312.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/c4kou1ap31g4aefbeoha53arj6/rurerufutosu.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/sujukelima.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af0740d8690---939122843.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/675a8be25262814b6f1fbb7cb0ed9c25/gamutogimukimeworeliz.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160fd36757e141---pumonofajulekezezopanor.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160974989e2444---17027789281.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/0784bc17cfe42eef903d76ebe924aeb1/zukifipizufi.pdfIn PDF document text
    • http://emyorganizasyon.com/emy/ckfinder/userfiles/files/16759065611.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_off0000e0ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BA 17580 bytes
SHA-256: ad7efeddda6a0a06e85505b26a0914cf59f78cdf2c871821cf82f821e1a4ad19
font_01_sfnt_off00010e30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E30 11100 bytes
SHA-256: 9eaa2b12a4c349c984cda0efaa140df196a2e9554913514ae0115151fcdea762
font_02_sfnt_off000127e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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