Malicious PDF — malware analysis report

Static analysis result for SHA-256 d80d241b9b90a540…

MALICIOUS

PDF

81.7 KB Created: 2021-09-04 22:15:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b6a41347d0581f5f07f14b29fdbe6f80 SHA-1: d540147749f5a0a006d703b9eeb385863f29da34 SHA-256: d80d241b9b90a5404a477df2f8d7fecf50ff566a747ba75b489914ec7e186951
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/uplcv?utm_term=garantias+individuales+y+su+clasificacion+pdf PDF link annotation
    • http://morecoredesign.com/images/imageUps/files/vodedanawavugavofexatoxil.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c327a7af7d4---zarofefowo.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/36379099116.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/9e534d38598c682cc9c3071a5e791fa8/93091953608.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160943363c0b4a---girerorod.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/zererubawetujesibinutov.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/92a64135a7346a5f750dd96d266b03ec/xovilupidadape.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16076b18cd0236---78422414145.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608120b2dc12c---348570222.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/jixavabakijavid.pdfIn PDF document text
    • http://www.toptehnik.si/images/ketipenidisupaseziv.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/30146vl335bm3kfuobekb3m365/870399145.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/luvuxi.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/rlnuodjkihj5o9io7t5b3d88jb/44482024620.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/bdhfg91rj1lufl0dou443o6rer/xonosex.pdfIn PDF document text
    • https://tempegaring.com/contents//files/58496099610.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/44193918894.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/zakegujejosarikupimutut.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/bfc651ed9e03772e237af63304e367bc/5769120117.pdfIn PDF document text
    • https://zakarpattya-tour.com/upload/xixidekokig.pdfIn PDF document text
    • https://rosanaalvarracin.com/userfiles/file/vogejaxipijizenalak.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/94537603048.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/svtp3ng076nlmtfuclutesnjem/terupivavokapuzobitezu.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_off0000da17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA17 18004 bytes
SHA-256: 31e64b4c8df0cb1788676e0ad21517a5dd01454599c3beba0a0398d80dc1416c
font_01_sfnt_off00010771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10771 10932 bytes
SHA-256: 39b5a67677b13bd86284a4905fa2e6ebdacafd2a13f59a6751a36a7735d28941
font_02_sfnt_off000120f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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