Malicious PDF — malware analysis report

Static analysis result for SHA-256 eefb1d2e6d5aa66a…

MALICIOUS

PDF

99.3 KB Created: 2021-07-14 00:03:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: de1689c6231d9c2d1b05e3fa1367f28c SHA-1: 0c3268c769b44f3fa84ae070e42c723e0f748054 SHA-256: eefb1d2e6d5aa66ae637307ed02aa40da52ce6e1ac95b7bc5fce834b95a80cbd
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or downloader campaign.

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://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786cf238590---vawewuzigividumorowiga.pdf
    • http://nordicaluminium.ru/userfiles/file/76214064773.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6af0d4798---wawuborejode.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c432119a88---zatopegibazubas.pdf
    • http://covinahigh1980.com/clients/1/14/147ee80f0cf2e08ca1b5067d21485a43/File/siduwokewomewok.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/f5361d63fc3fa12f44feb0b5292a8953/lifubiwujizu.pdf
    • http://championsview.net/userimages/32471990450.pdf
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/73094393710.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/56duv0h5n0jgjtplqv32fj9ubf/23472855580.pdf
    • http://steelbo.com/uploads/admins/u0/files/20210626011519.pdf
    • http://ghalemdi.com/userfiles/file/59153081297.pdf
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/a2c06b515c8869340b1de7db19d78482/novunoganowesusapajavuka.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f61862e37e---ribodidap.pdf
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/f6lhpf8phatm3nhe5i7u0df2b5/1096709873.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/4284mun7a6t0t672hn8nspdhs5/monuwopoluruv.pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758c0d1cdaa---godiguzugumoxenekiwoj.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/b0531f4ccf55404dd1971b0b211bd5bd/69078623414.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b19dd7ead87---verelenemerolegomunirat.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9fc0dc47c---luvifodifufu.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/6af44bfdc474d9eda80871a37efe57f2/2579947273.pdf
    • https://china-glass-mosaic.com/userfiles/files/20210625_030618.pdf
    • http://tw-go.org/files/1567055092.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=city+of+ephraim+in+the+bible
    • 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_off00012543.bin
d34784214c89cefd35bbfc2225affcaaf0f1df42a3fcc058b4c114f52f9877e5
pdf-font-stream PDF embedded font (sfnt) at offset 0x12543 16488 bytes
font_01_sfnt_off00014fc2.bin
17b3582f4c8a0fdc97dd85d9accce7902675188a0d57c2122276f5b5c4bc930d
pdf-font-stream PDF embedded font (sfnt) at offset 0x14FC2 10740 bytes
font_02_sfnt_off00016813.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16813 16792 bytes