Malicious PDF — malware analysis report

Static analysis result for SHA-256 285a9c8819702a2e…

MALICIOUS

PDF

83.8 KB Created: 2021-05-03 12:44:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: e2cf413514d2428a2a62f1f98e4c7cb1 SHA-1: 9377e6872a2cd91ab86e56c66c435b5e7757c778 SHA-256: 285a9c8819702a2efddcdf8f9e7d7b29d65b4dbee9b7607bb341247c9d75a393
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to redirect users to malicious content. The presence of numerous unknown URLs further supports its role as a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/48d2157b25ae764d363200875008cbee/73520377284.pdf In PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/2d65a6e728d9c8f510eafa65462ba3f0/18746013399.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/0fb8a1008333e6dc1184aac5b181df64/20505571417.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/7eb30afa7460e71a232731932f604955/62157139885.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/49098664003.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/37a7109103eed62011cbdb26e63d0423/86722671216.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/786a46076e1ff130aa1706d43e1f433b/26062650328.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/ffcfa15998387889c02e3021e25c35e6/61309908055.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/st4ppgbraf89b6987m92sshd2a/sozulewig.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/it50sd925l370ns3dc1j2ehfcu/niwaxuf.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16077a9bec5430---visozopuw.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5d012dfb1---73919265878.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/37947e8f6eca18bad570d5e1d8da3947/77460939235.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bdfe6e981e---87426258878.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d97c37f777---rimetalonegafakijaniva.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=paintshop+pro+2019+ultimate+freePDF link annotation
    • 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
    • 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_off0000e6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B7 5624 bytes
SHA-256: 65d802880f552c5919dc4f361929359ba9f939689d51fc378504b6f385c96f9f
font_01_sfnt_off0000f9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AB 21816 bytes
SHA-256: af97dc40e44150b49bbab66be98131f2aa2669688cf2ecd74c73010026c156ef
font_02_sfnt_off00012b3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3A 16060 bytes
SHA-256: 503f5200e83b189a546b6c6e1d808633a9135186956fe76ff9bd78de3d91e3c6

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