Malicious PDF — malware analysis report

Static analysis result for SHA-256 922164a1f25f2ae9…

MALICIOUS

PDF

93.1 KB Created: 2021-06-30 13:55:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7af45776f5d8e579ceab66f157f55813 SHA-1: 111993d160c2bb13ae9981f051b57e09fc56fe7b SHA-256: 922164a1f25f2ae9d735551de1ecd7db91d50e2620343e256c10c4cdefd9c166
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 file contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's used to distribute further malicious content or phish users. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://baigeleather.com/userfiles/file/vodupum.pdf
    • https://abhimaninteriors.com/ckfinder/userfiles/files/18124895551.pdf
    • http://citadelcaralarms.com/userfiles/file/kaweduvuvabiwuko.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/7d25cb40067603777f2fdb7ba4a64b91/muzavifuwu.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e867e673d6---tekilivowu.pdf
    • http://lideparts.com/userfiles/file/1622045496.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/956506524e770b988800453e1fd87c0d/55623339331.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/a04f5dd3b70fa547820be0d949c65b05/masiwufus.pdf
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/3rcmkkgs963skkh08n1igsd3o7/levasuxoj.pdf
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/bce4b9ca822df0407ca756a88397c428/54516077979.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d0a5f26bf---38964841753.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3d078585f---gunodomavu.pdf
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/e4cb3c73638c4befe15626ade7e26ec6/pazuxuzejosomoxesoritaj.pdf
    • http://hugslock.com/app/webroot/img/files/gixodedeguledajebanab.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/urdmit2uhek1a97jmjgamuji7m/zajedumivosi.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adea5fd9225---93853496505.pdf
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/a374b9a4bfd4a9dc3d11c937c3c8e2e3/xobexipafogox.pdf
    • http://x04ydivan.ru/userfiles/file/febavafafipamutul.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c70d063ae92---28076754020.pdf
    • https://nabsangram.com/userfiles/file/93492720971.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/f1civsgj4p9ra1n45q696k3030/64377100817.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a37a89bbc---56564430070.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=cruise+ship+jobs+for+freshers
    • 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_off00010aac.bin
80b92af025e9ee8e4422685df10f3b9d61e538f0b0ccfc88d4b674a92b63e959
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAC 10448 bytes
font_01_sfnt_off0001223d.bin
f7b8cc68b9035bdd1d574fa58428b7b8e280bc32a1d517199d95581da963bef3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1223D 17360 bytes
font_02_sfnt_off00014f58.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14F58 16792 bytes