Malicious PDF — malware analysis report

Static analysis result for SHA-256 d01b9d0f2806a799…

MALICIOUS

PDF

83.0 KB Created: 2021-08-19 15:34:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bb436a5c7ce76e9e2783265a2274edc0 SHA-1: f8a6d97b9f032ac0b8f31bf7e511706d38f004a1 SHA-256: d01b9d0f2806a79976068980a28e3d2eacdb31e79eba67ef8f289c1e45689886
184 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 suggest it functions as a link farm, directing users to various PDF files hosted on compromised CMS uploads and disposable domains, likely as part of a phishing or malware distribution scheme. The presence of embedded URLs and the 'Fake invoice / payment lure' heuristic further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://csc-0898.com/userfiles/file/20210611173326_4czcnm.pdf In PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d53ba83dcc---jalidosuni.pdfIn PDF document text
    • http://midlandhigh65.com/clients/6/68/682e31fde28f8c6bff7ebba57332ef5f/File/74010805175.pdfIn PDF document text
    • https://harom.ro/files/file/numiluxubutaxewalirexif.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/58460125460.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/39414429495.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/bcba032aeebf4946a94c468ae114ec87/jarelugivudikosisamikozid.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/zabupiruvabamibamuse.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/1qk3aenar6np5c0jp36it5n006/janakujulujodolasoxij.pdfIn PDF document text
    • http://drironcat.com/images/file/vakojeluripav.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111329cbc8c3---vinenewuzijesevigufanijov.pdfPDF link annotation
    • http://a-aqua.fr/ressource/site-image/files/jugagidobunajaruv.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/fufiravokejivadibur.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/ru3o4b0djl8ddlscugapqm6ngl/vikutiruxi.pdfIn PDF document text
    • https://fotokeramika.bg/userfiles/file/21353254758.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/divedek.pdfIn PDF document text
    • http://geniuschulatutor.com/userfiles/files/89979843653.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d53311d74d---32393120918.pdfIn PDF document text
    • http://imi.vc/upload/files/57929117391.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d7a1d501415---67934501480.pdfIn PDF document text
    • http://dgxzz.com/uploadfile/file/44247346204.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/fumojamitave.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/gr2mi2vfo0rg7kksmjdvln28m6/19426709791.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/lugeliminamugezavodigofos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+make+expense+tracker+in+excelPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/48631744603.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_off0000e06c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF883 10808 bytes
SHA-256: ef4f87ece9a2ff6a3f799b1abc51c4f0f110622760bf6ea471b4853f087b2123
font_02_sfnt_off0001116d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116D 17460 bytes
SHA-256: 26ed8817d8d1eb104ac22e79cdbe764b5d32858e9a817cdd5602f5893a9b25ac

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