Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa87e46e879072a7…

MALICIOUS

PDF

74.5 KB Created: 2021-06-11 09:49:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 6b50a5d7ccb3bf70a38dbb499f8ddec3 SHA-1: 5c45be9682d4c660c602c2cedfe07bf6eec4baea SHA-256: aa87e46e879072a7d4bfa68834cbc3fee94ac0df5472d82f8a63a738657f3529
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. The document contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The presence of embedded URLs and the overall structure indicate an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://inwebjor.ru/uplcv?utm_term=read+one+of+us+is+lying+online+free PDF link annotation
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/d3e6646493bd3259e561fc16e1cb08a5/karalo.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/dpg5pu92bps1sfh98eeptiauuf/xitatodagesawof.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb80074b1de---gizaronadilaxazuxigijefe.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2f468fd05be689b3a022d81fa5e82009/56723884863.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/bizenenorexawikepo.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/34a975b0655ff9088d22fa330fa79dcd/nupulujeb.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/8f240316b69b25e933ded1c7fb173acb/roluredigedapakenulib.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b236b44939a---85236355984.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ceccc3ef10---20498256433.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f55c543905---56101619287.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/4qo41vjke3s4o51rge82gseptu/65476031878.pdfIn PDF document text
    • http://e-cluny.cz/UserFiles/file/74804189772.pdfIn PDF document text
    • http://candientushinko.com/images/file/lolapetazavolosijelazog.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092241e02ce9---xemadeduziru.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/9b0cd7cec34419bcf9d88ff1ba73fb78/89729276268.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/0e2e4b2e3ababccbc4f6306384f2b20d/9743622493.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/94ff30b61dfacc0cadbc9e257e06b819/kugopiburosewufe.pdfIn PDF document text
    • http://aplus.to/userfiles/file/duxev.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE571 5184 bytes
SHA-256: 92efd90fe951c72af2dadf1b269f8aada0b3886d30c8eb149cce708f8a88698c
font_01_sfnt_off0000f735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF735 11004 bytes
SHA-256: 4021a869c9c7451263effb21eb0729dc9057893d4488464343deb84dc7b81137