Malicious PDF — malware analysis report

Static analysis result for SHA-256 00efba44d8ce98ce…

MALICIOUS

PDF

79.0 KB Created: 2021-05-11 22:37:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 90d90bf58b77d8fb5f028f87407387b7 SHA-1: 10b5ecd4360d67ea09921e5a17b5566673897188 SHA-256: 00efba44d8ce98ceac9811e82ed2ff3c4f328fda84703e7b584c032e2789e0c7
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

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 https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828f03c4f7a---lobekifakadewuxepefedopu.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086d8709e103---daxakusa.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/683990f6a4c305f8caadc86cf382cc67/dotabedupikeripokopewu.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089452c64f6a---74210590664.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160997484b4ae0---29198265337.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/qet2dajibvahhvrtj5kco12njn/37159583789.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607475b581ebf---kigidizipojakozozup.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/a3f85b93f124a3fecdff64f330d6655a/zinagazasuporanuxun.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607efcaa10e83---50073012834.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/7886f47b97d26c10c78f2b47112d4e08/pulilomexigumovimu.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607caafb34eb5---14439190064.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608916b378649---26409305627.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609677bc718e7---zugogajit.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/7c13e63b3e4ecc2a9b2ef9029aa1fded/tuvufemovagininexosive.pdf
    • https://zlatartopalovic.rs//files/zepenitivob.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/nhqci73k96i7a4lmlfgi6tvgm4/numudufukazuvona.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16090745e206c1---pazugose.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=casio+scientific+calculator+free++for+android
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f702.bin
3dede6d45d0364db5aaa47557d5e35dabb2efbfc5f7492c119d07f3338e26aab
pdf-font-stream PDF embedded font (sfnt) at offset 0xF702 4920 bytes
font_01_sfnt_off000107c6.bin
5011019c31d3c302ad3354343731dd12325a4ac937c0e4c3cd698ad346322862
pdf-font-stream PDF embedded font (sfnt) at offset 0x107C6 11488 bytes