Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d27fdf6090cca63…

MALICIOUS

PDF

85.4 KB Created: 2021-06-26 02:02:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 5bbda3f610b9da7a027b49dcf223d578 SHA-1: 05671c07638d1b60b475366afb9c07b09bf3af49 SHA-256: 6d27fdf6090cca63079889c370e0f982467a101a4cc514625caa89a9edf5f838
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URLs point to a common tactic of using compromised infrastructure for hosting malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://smidgel.ru/uplcv?utm_term=exacta+meaning+in+horse+racing PDF link annotation
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098958017564---1786367177.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/91298675810.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/75893218306.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c154e6070---47018984310.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c90ee72b5b---zavikomawumupovamawexuwu.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/96d89af139d18731138e971000ebba18/49044338228.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/f666bb998fc90a1953e3f07200e02205/641163886.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/7gmqjhjge4hb91hiabsf37f770/rezovovigudubisuzaxevuwi.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/47833322474.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abbc1b1b767---64245797616.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c11bcaa4965---93250017229.pdfIn PDF document text
    • http://sshs61.com/clients/6/60/60e739d5a8cf4a6710e4f064fd99417d/File/89473566658.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4d33124144---94574852161.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/ef10eadc4897af67b26b9d1b7fe08f06/77858905839.pdfIn PDF document text
    • https://bem-sa.com/img/file/82248085194.pdfIn PDF document text
    • https://atphp.ch/userfiles/file/liweruxofuni.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/5fbf966499252a88794068600dba283a/gapotoxepadisegudif.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/63bfe3520752e927a5fd2cadf4badc46/94686591000.pdfIn PDF document text
    • https://schmitz.cz/res/file/lepafat.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/43856747278.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/mowaxawigifulewetid.pdfIn PDF document text
    • https://rhodium.vn/uploads/news_file/39544126481.pdfIn PDF document text
    • 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://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_off0000eb4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4C 17200 bytes
SHA-256: 0b5fa72b14c2d8b04ecd45e0edf2db18658945fa0d53980cb02690a2f081108f
font_01_sfnt_off0001183e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13055 10716 bytes
SHA-256: 88bd75cbea59a22606372a6d60ec500d1b2e3acd082cbfcf5612d8d7c3d950cc

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