Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e989f20bd38fa7a…

MALICIOUS

PDF

58.8 KB Created: 2021-05-02 12:58:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 840967633a3d3d90252efea4f55e15cb SHA-1: 1efc21dd78fac1306a8156b2f4b28ed563d2eedd SHA-256: 4e989f20bd38fa7a9e53a99433c4411b27724d820cf5adbb05a770a6594d0aad
154 Risk Score

Malware Insights

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

This PDF was detected as malicious by ClamAV and an ML classifier, indicating it likely exploits a vulnerability for client execution. The document contains a link farm pointing to multiple compromised WordPress upload directories, suggesting a tactic to distribute further malicious content or manipulate search engine results. The presence of numerous distinct hosts and links per host reinforces the link farm characteristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

Heuristics 5

  • 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
  • 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://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/a2425f88c4e7c9632b7ce7ecaf583b13/57231713014.pdf
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/655eceec20b9f5f28c118666a69e3214/38792899061.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813b0998227---8211093757.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/d0004d93f3a9f61c0ae973107ff53bdd/31236079249.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/uvr7t9si32tlp2itksp1q5tmg2/fuwesiruzejerovunukewop.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/1r6lmuo6keb8fm3euaubh8g1t2/81296429284.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/njipusomrj0m8tdh00guc6st5d/39392725055.pdf
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/b1a8bccd8615b2cb9153ae8f03427210/98489967405.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160813a0d006d0---xokakimajaluxer.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160769eb2e0aee---vidujapikufinaga.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1607df65d6ab62---rafejegudabebe.pdf
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/c5b1e4833d0a69f531293fd4c74bc53c/tutorijudoj.pdf
    • https://anmimar.com/royal/userfiles/file/57699935261.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/a9966c48893ace931e4438b15940d39e/98937300811.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077843c16ba6---giloxididewudi.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/qsi2hajgo4qhcq6s6b2558hcm0/wosejeg.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607337b6b59ce---fesigeromejivo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=49ers+injury+report+vs+rams
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d86f.bin
3994de3aba0c34164e11aa2642f562fd3e37f32f85227c8d2fb382a32217fbfe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD86F 5320 bytes

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