Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fb16a4020c01c89…

MALICIOUS

PDF

76.8 KB Created: 2021-06-12 23:09:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: a32dfb9714201ce6216cbda8355da386 SHA-1: e5322096370563984150c39bfedab38bbc68b362 SHA-256: 2fb16a4020c01c8975b96053d093f3ce91f7478fcfc43109eeeb511ada5b2527
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://philabc.ru/uplcv?utm_term=baat+dil+ki+nazron PDF link annotation
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/81e367c77dc353fc490c07e44f47fa76/70609604870.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/75330be44250eed448942d898ac9fd3b/43056724797.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077151ccedc9---fagetewo.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609a413c8ef70---suzujatudejex.pdfIn PDF document text
    • https://citrasas.com/ckfinder/userfiles/files/96725713045.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/sixureli.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/936e7506c0e076b298ff78c455aa2f42/40227905111.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/290815144649.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/39249759039.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/91b7e6ae19898e826c40da3ce78cb613/830103844.pdfIn PDF document text
    • http://slsnn.ru/content/file/kekofafogelarel.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb9172d457---dajukin.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/67c6f1110f2d8612d94fc9ef0ff6e9f1/35837901243.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/995732aa1ce2befea2b460e48a3136f7/bifes.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081aae040902---jujawelawumikaj.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3405a58e09---fumiwenuwaw.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/95991097711.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbb3461804---mubekadokanarodixupesefa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off0000d9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E2 4804 bytes
SHA-256: 8366a9c65826905b3ea028430a4479b66ce3d235fe81f3170330ff5c3c65bc7c
font_01_sfnt_off0000ea4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4D 11224 bytes
SHA-256: 4edf815fdd07150412741ce0e3c07ee762b3c8d635a8911d05310588d35720ab
font_02_sfnt_off000110bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BD 16164 bytes
SHA-256: f469c5aa689aa4c1965481b78cfaebbf1c3ebdad2306c7067134b7b4aaa0addd

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