Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c8f87fbe41d70f5…

MALICIOUS

PDF

84.0 KB Created: 2021-09-01 15:21:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2cf9b6f6cf2fd62d8a614fd6153a7e58 SHA-1: f2e29bbe0684f4e41d06eca343ee8621a3a22e15 SHA-256: 4c8f87fbe41d70f5b86827dd9269adeebd18dbc6df68d53ece732a299b4bacee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern involves exploiting user trust through a malicious document, likely as a spearphishing attachment, to redirect them to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://ketchas.ru/uplcv?utm_term=what+is+a+tier+2+background+investigation PDF link annotation
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/ee49a35eb0912d29312e2bc769a2756b/xefiwul.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16079602f203d8---36224565835.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160735fef8476b---xizolekinogiwatobiwa.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086f92629540---jabubutugeledugiguwupu.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/betinemoxiromedoboroxiwud.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/selumesazerojogemuwen.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/58f7960c75694a0b4a6ba98e36f7ec74/51823940400.pdfIn PDF document text
    • http://skncn.com/u/files/27831947383.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee50875c8b---porisamilutexajuna.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/12008019268.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d94ed150c5---kidosukikerulaxokejuwome.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160a746130cb4e---modifojigujajupaxasufe.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/87e14a08b95a08bedcd9cf811c43e12c/34803508247.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/vumijopiv.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/97660859169.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/n7cgkl5kbcondimqur1sp87f45/78732943940.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/5be78add3d1c7a742e6173f15ad888d1/82466798357.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/wopisolefa.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/gepemedepuwipelimeme.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/0ugc8ik7o8go169gad438hg7lf/8627335750.pdfIn PDF document text
    • https://stopserv.ru/files/file/43466209004.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_off0000e2fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FE 11116 bytes
SHA-256: 237328eae5fb5123a4855b86abdbe7af749664ff19c97c0abf3178079e2621e3
font_01_sfnt_off0000fccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCC 17308 bytes
SHA-256: bd5046ed3763458dc6be9eaf908acef54f8b44a1856045ca34d4e5a4184c4d30
font_02_sfnt_off00012960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12960 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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