Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2905b29073ebf63…

MALICIOUS

PDF

82.4 KB Created: 2021-08-24 19:29:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a33500da2061d5a5117d15e148b05bf9 SHA-1: 922aefc83708ebf620ce15f11a9ab08dc4fe9276 SHA-256: c2905b29073ebf63036ff7a54b86ad4df6d01704652ba3f770168a453502ca0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs, many hosted on compromised or disposable domains. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics suggest a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nomylo.ru/uplcv?utm_term=connect+4+aviation PDF link annotation
    • http://hysansam.com/fckeditor/userfiles/image/gonirizazewatanuximamit.pdfIn PDF document text
    • https://whitesal.com/data/images/file/5524_20210713045032.pdfIn PDF document text
    • http://suurelepa.ee/data/file/napuripitarenipox.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/98355634583.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/27642730665.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/mu35o2k2dtnangr2k5q2neid97/xoderepaxivetevasexojomem.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a399d2c8e9a---74471491017.pdfIn PDF document text
    • http://heyibnb.com/CKEdit/upload/files/vizulorimedowatefa.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/91593310017.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c256512240ba5e0a8bc2829a5a430b4f/wopibuwaguzov.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd8961ac3e---milaxefepaxix.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/74434469577.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f597e3ba2aa---vufofumik.pdfIn PDF document text
    • http://elai.kz/upload//2021/08files/210811215118282340fhbcs.pdfIn PDF document text
    • http://eltprof.ru/userfiles/file/31907525838.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/46256015502.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/kifixarunetuzoxevumi.pdfIn PDF document text
    • http://underbutter.cz/download/foto/damopopodupixijavifedis.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16092042c6322e---jipuvafujefararigumexokak.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff604961b6---vopegupomijuwinoj.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774c79b14db---16336390460.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/j1csjtr14hgmd12n4fob2mkdo7/42473892954.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/62327068280.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608efe1d5306e---42018002645.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_off0000dbeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEB 18160 bytes
SHA-256: 5538508b976e9b46527f87e544e7814429d0f9e99b24d1c031788baeea9dc57b
font_01_sfnt_off00010c24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C24 10084 bytes
SHA-256: ecbc1916b42b4de1d1abce5bca2123f10001b782c9199f8c9d7754059afe3fc6
font_02_sfnt_off000122da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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