Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1641a4dcec38786…

MALICIOUS

PDF

98.9 KB Created: 2021-07-02 13:25:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c05733b17ce375ac6bb6b38b4cc6a6ac SHA-1: 1bc84b3aaa5c76b9f0ac6054531752578b9a739e SHA-256: d1641a4dcec387864e171ecd174b1489a71a6a0fbbb2ad825c20390711f0498b
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://nomylo.ru/uplcv?utm_term=avengers+movie+collection+tamil+dubbed
    • http://beveragesgs.com/userfiles/file/61501192932.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a78056150a0---gevewomikikapaf.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5fe6844ee---bivojepuxogonowetimojelig.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a713706ef65---95810459427.pdf
    • http://xn--szabowski-tub.pl/userfiles/file/20791630642.pdf
    • http://smolensk-bakaleya.ru/userfiles/file/jitamubot.pdf
    • http://andrewsexes.org/clients/867461/File/32879113315.pdf
    • https://cavalier-hundezucht.ch/userfiles/file/vekibafila.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b9942d7c4---17896663409.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c0368a186a7---dusil.pdf
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1771a502a5b93520e179ad84b43fc8cb/92234310894.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607b79dd96226---44375611584.pdf
    • https://alternativecarrepair.com/userfiles/file/gofopusemejesifefubi.pdf
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe2f1ef3ca---15742036387.pdf
    • http://sanphamhanquocymy.com/uploads/files/bebululumuzi.pdf
    • http://moon-villa123.com/CKEdit/upload/files/31881793614.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607b76c67e615---xolawefolefo.pdf
    • https://gikguamerica.com/userfiles/file/47832385033.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/da45fb76f476785563ab38686e36f32f/pijexe.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/64b1039aaa3cc6884512a70b8edd4ad0/53158288041.pdf
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/cbfbbc118661ba00a4319cae10031a6d/83313134283.pdf
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2ce44f4c5---lagapipejobefutedatin.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/xopanulesuvuboso.pdf
    • https://amblamy.ee/upload/file/13410750856.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011de1.bin
b0fb68008b8fd0940e3a80cd69cd51eaf120ba6a578e3871a8145c9142469a0b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE1 18108 bytes
font_01_sfnt_off00014cd2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14CD2 16792 bytes
font_02_sfnt_off000164e9.bin
8524da195c70326fa6a51fb6f58d8179e9984f5399fa96b07451b57aab9d84e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x164E9 11000 bytes