Malicious PDF — malware analysis report

Static analysis result for SHA-256 c42db96a77681909…

MALICIOUS

PDF

92.7 KB Created: 2021-06-25 21:06:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7bee463a26305559d0405b31b0d9ee91 SHA-1: fee4f1f41e3d33a371c350f2185639b436ef1bfb SHA-256: c42db96a776819095947f6e0b31d07c02b58847775f9b5ecb1203c9b1309138d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the overall structure indicate an attempt to direct users to malicious external sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=pic+basic+projects+pdf
    • https://nhorizontours.com/userfiles/files/zonowokagefa.pdf
    • http://ahcxdq.com/uploads/file/091448262249.pdf
    • https://triosms.com/userfiles/file/2042398211.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/58o3hm0islsq0g2d3q21uogvpi/57497187988.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/8b542f872f0c9e815e0c0d8cf3f82f24/94130246758.pdf
    • https://naoshima-habitant.com/dijilagagagupi.pdf
    • http://agnieszkapawlik.com/userfiles/file/gisewofulak.pdf
    • http://aldo-ins.com/userfiles/file/lubenuvibumesewuda.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/e6f9459e46a2112164cb4cbf6d7de8cf/95403202969.pdf
    • https://aadhaarretail.com/administrator/imagetemp/file/gowopukakanuworezin.pdf
    • https://larustt.com/upload/ckfinder/files/vokowude.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c28875299---nuwetozapedubek.pdf
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/a5cce9a6fb3e818a0e25d9ff5b603c55/230123568.pdf
    • http://thepnguyentran.vn/media/ftp/file/famigozopape.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/203b274cec87c659cdd791571e613379/feselomefejiz.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/203cac18e6aa86612f113eb3af3b3fa3/tufazixobomesozesop.pdf
    • http://quaint-house.com/kixojirejijizube.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/75o31538lbhbkc420up6pvf8k5/navabopatiderikog.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada92e825bc---90403906148.pdf
    • http://sun-tes.ru/files/file/45339919643.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4fd6f1d7c---depexisagugogunozuj.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/68c74c7d5a196e2c8051b8eeb0be4b80/49078592665.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085922e2d5e5---81409031584.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_off000103c3.bin
23942f916dc5b6f267b0c1f582018902bcacc09b0e23fad4902f25ab6ba259ee
pdf-font-stream PDF embedded font (sfnt) at offset 0x103C3 10736 bytes
font_01_sfnt_off00011c5c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5C 16792 bytes
font_02_sfnt_off0001346e.bin
11c8d991f4c1060d225a838d212d7407cb0c32d9a91c1aede7f11bc5bd75b7c8
pdf-font-stream PDF embedded font (sfnt) at offset 0x1346E 18612 bytes