Malicious PDF — malware analysis report

Static analysis result for SHA-256 391274e959c146d2…

MALICIOUS

PDF

87.8 KB Created: 2021-08-17 09:24:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 57ce998f622f69e517d6f45c8c0bab2d SHA-1: 193e0faff99ab017abdba03cda4e753be092eb5c SHA-256: 391274e959c146d2723b33c09b28d5b0e0573c9c03f153b4c1bff34bb5e8fbec
156 Risk Score

Malware Insights

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

The file is a PDF that has been flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised websites hosted on disposable domains. The primary goal appears to be leading users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8c0b6afec---45055936393.pdf
    • http://geobrofab.com/clients/d/da/da7cd3953015cd63472398095fc1fcdd/File/sedefivomukenavirepu.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609684604dc34---betutulazikuvijir.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/18469312160.pdf
    • http://sva-jeanroze.com/xmedia/file/xifus.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/p3fjpcflcebe1jjb49jln2tmb1/6012017361.pdf
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/zomaleg.pdf
    • http://www.hgekc.com/media/userfiles/file/kigujadafetegetixa.pdf
    • https://nomortiga.com/contents//files/vujogizigagijuti.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/d9bb0cdbd73b8d6e3d3134f2034f26b9/43896451601.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945a55065a6---jagewerejalox.pdf
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/sbs511vbchv69lceqlm1skla8i/76116892367.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c324e25b77a---70272457577.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/65537a2f9a06e3a7842df46ca8faadc9/90710193504.pdf
    • http://champaigncursillo.com/userfiles/file/jodijexawidi.pdf
    • http://doktor-okonski.pl/uploadimg/file/biwejafedifezanavomeme.pdf
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bedb2f6f3f2---gawoxukalituzebe.pdf
    • http://cukiernia-waltar.pl/qcms/userfiles/file/tapifaboso.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9e93d4898---17594836868.pdf
    • https://anctools.com/ckfinder/userfiles/files/40681882107.pdf
    • https://kar360.com/resimler/files/zugituwezusefo.pdf
    • http://china-hold.com/UploadFile/file/20210811164725308.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/jpns90vu7ot59k05tjpvj38rpe/14212304917.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=sd+card+formatter+apk+pc
    • 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_off0000f380.bin
624fc90e61594ce8722f22d688741788f2217bb68400234b18f7af570894012f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF380 16968 bytes
font_01_sfnt_off00011fcb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FCB 16792 bytes
font_02_sfnt_off000137e2.bin
05329ae91c66fd8e870c7e7e9a81ecc29c92bfc079c5f4472b05d26b271ae8ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x137E2 10540 bytes