Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bdebda5a84187f4…

MALICIOUS

PDF

80.0 KB Created: 2021-06-25 09:29:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 55c29e936a4a6f1c3f87406eeec027ff SHA-1: 694a6e0c497ac3f36a5b53099c4bb2098082cbd6 SHA-256: 3bdebda5a84187f409619e43ac12101b12736ffca9844af843bbcba75b8a6c86
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains references to 'delete cache files premiere pro', which may be a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://huerural.com/uploads/image/files/burulozuwigavufaz.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/8vfd7hgojufcfv2mmocml027pe/61171563236.pdf
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/8svltk47k7fes2ofqo4vs4se8u/giwujugodabifu.pdf
    • https://lecapsuledigian.it/file/8221593978.pdf
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/edd939523e0d9ddff4e2478fbde8f3b7/gavibulusurekodun.pdf
    • http://cunningham-reunion.com/clients/7/73/7399477c88ef979e1ad3ac38e42cffcc/File/lefatizoso.pdf
    • http://mpti.ru/userfiles/file/59070996420.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c29a34e3d---87491728660.pdf
    • http://faradbox.pl/files/file/juradufalorotosagomakok.pdf
    • http://pkynfe.net/userfiles/file/suvebu.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/a869bdb5dd9f8906f2392b7995e95aa1/perinotunolinagunow.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16093af4e43494---lekevorejixerigu.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/13oknfpk2cpmgmupqk5q6haoht/70402266580.pdf
    • http://adabaskimerkezi.com/upload/file/wobegabavefuzigegevemiti.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160739d146c457---77907602296.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5eedd1951a---vipadubivolovajepure.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5670db13c7---93943334253.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=delete+cache+files+premiere+pro
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbb9.bin
f285e7cff74fb20c47c22ce1f14ae4ad46f565a3e9af1c96b251da558e8bffbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB9 5252 bytes
font_01_sfnt_off00010d75.bin
e984e9d3d66affdfcde9f98fcfa8310a0261890f31fa79c094381a795d6d2ee8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D75 11156 bytes

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