Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ff143c868fdfd87…

MALICIOUS

PDF

80.0 KB Created: 2021-06-28 22:14:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1e22fb1c322f176eeeab1b7dd4c181fe SHA-1: 111ac5c8d9ca03367705e07648a5a3bcff6cd78e SHA-256: 9ff143c868fdfd87db90ace3ac47e056e0ecb8fb44c7503ba0c17f2fdc24fa89
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, directing users to multiple compromised WordPress sites. The presence of numerous links on disposable hosting suggests an attempt to distribute malicious content or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b270e488eae---mijiw.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/82f73d52370b0ad75ed9dd11bf5dd89e/67993746187.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaaff762f1f---vebodefekexojapofela.pdf
    • http://lamachine.nl/userfiles/file/48133718302.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae34b7909c---nunukekeriwepes.pdf
    • https://stopserv.ru/files/file/97041030388.pdf
    • http://gramercy-grand.ru/files/file/99455676461.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16074298c8a22c---42677051158.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c238332a1b---91583565172.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/a962da57f29b70d217943c89b9e2e0fd/78509625241.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5457479ae---sogobedukemuwe.pdf
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/f274f3c3d91655905e3fdf29d8265dbd/58156729486.pdf
    • https://pfollowers.com/ci/userfiles/files/sogixela.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160795c5e29fa5---65461167882.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/696b84fe9b7fa85960d3efd7657ad850/vikepagaxi.pdf
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/faal5s6e02q3t3alod102h178p/kotogusixebikub.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/a869bdb5dd9f8906f2392b7995e95aa1/perinotunolinagunow.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/90dhko4g31vi5kdglklrporv86/17946061126.pdf
    • http://rheumatology.institute/upload/content/file/31436516326.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c45656251---ritijato.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf306b96da5---tazekotobikokes.pdf
    • https://aneri12.eu/res/file/pukimemewezota.pdf
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/204c817c8d56c4505eb56866e3323658/fewed.pdf
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/38dg4f5nmpcn2rdqgra985qaiv/29538076513.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=paired+passages+grade+4+pdf
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d808.bin
a167da92af45d5b4316718c8d8e8ae46a4b05583b6290c547abd501d9a2acae2
pdf-font-stream PDF embedded font (sfnt) at offset 0xD808 10384 bytes
font_01_sfnt_off0000ef6c.bin
b1dcbd0a5e68f8077f62ba2369f6bad6fc1c254141dcae490fbcb9a0ae5e4e48
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6C 16580 bytes
font_02_sfnt_off00011a77.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A77 16792 bytes