Malicious PDF — malware analysis report

Static analysis result for SHA-256 e25756b11fd44a15…

MALICIOUS

PDF

100.1 KB Created: 2021-07-27 15:58:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: de63087fe518a82df828b845edcf2961 SHA-1: 8159329947648616b7a1769305a675c69096ce80 SHA-256: e25756b11fd44a15ff397dab2a3813dc972bbd936be87a6cbd011a6f191ea8cc
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress upload directories and disposable hosting sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded links are the primary indicators of this malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16071447f6d05e---34658898697.pdf
    • http://evergladesharvesting.com/ckfinder/userfiles/files/zoposasupogijororetoreju.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ace125789---10439624843.pdf
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/7e5c1fa8eb1ae338735de9957c1f1e4b/dutozuzatetulexawiga.pdf
    • http://perseverance.cyou/updatefiles/file/vinefa.pdf
    • http://accessprecision.com/userfiles/file/26132833311.pdf
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/9d72f1f37db9a65076879ee7b5d1764e/78726687971.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/80e22aec29de8ecd742dd3b5ed2fc2ec/15343248285.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071fd091209f---15951308877.pdf
    • http://hzbmsj.com/images/upload/File/90134262852.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7027a13065---35512890791.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609618f3c7e28---sezavoperovokek.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/d4f8bf791a856ee64c30d6e7b56f5542/29961648659.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886706355af---fojofotajamodixo.pdf
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/ffdcef59b4b6adfd711764fe59cfd1d2/bekujutigipe.pdf
    • http://amandamaitland.com/images/file/ropejotinufawokuzufali.pdf
    • http://101-games.ru/images/uploads/files/dulazitekadijokawizevefu.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/7db5fd787ec3c03c9362ae7fdb81a3ca/53848426545.pdf
    • https://giolog.biz/images/bulk_images/files/roreriwanaxudoripumefato.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608667594aa24---1930451056.pdf
    • http://arablift.net/userfiles/file/61987115845.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e83ea03a81---97777755876.pdf
    • http://brnc85.com/clients/878796/File/21213540860.pdf
    • https://mmoxx.mn/userfiles/files/moginu.pdf
    • https://rubyyadav.com/nbloom/fckuploads/file/fanegasusavenadeze.pdf
    • http://reanda.com/jingkelun/userfiles/files/20210725235250.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=what+are+the+principles+of+training+in+hrm
    • 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_off000125d0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x125D0 16792 bytes
font_01_sfnt_off00013de7.bin
16a6c095bceb3bd193c52aea1938c9a894f88765469ce73363c58f21f33956e5
pdf-font-stream PDF embedded font (sfnt) at offset 0x13DE7 10920 bytes
font_02_sfnt_off00015708.bin
aaac5acc557e84a23d2bf5d21c2aa79ed3b03b05cafeeac44e27a3df0e6539a3
pdf-font-stream PDF embedded font (sfnt) at offset 0x15708 16800 bytes