Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a81491c5f453430…

MALICIOUS

PDF

90.8 KB Created: 2021-07-06 05:10:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4b4a6b308269777c8575e145103204b9 SHA-1: 80df2831a2d44618f0719a1f024351079c35e08b SHA-256: 0a81491c5f45343024cd0b061417f0122b2ebe3894b4eb7df9dc3625cd4e7730
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. While no scripts were directly extracted, the PDF structure and embedded URLs indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a203e0d3e5c---nafesarokawedabiki.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/j3p8q8r2cl7oerdb3ea6hcjbm7/25766744943.pdf
    • http://datavincity.com/uploads/ckfinder/files/86520963304.pdf
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/8dae26addf7fbf74dd2e786d408e0f68/buzoladuraxapemomajelawun.pdf
    • http://datev.hu/ckfinder/userfiles/files/38694120860.pdf
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/gonarabokidipabanono.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609698289d9bb---najidumozosifipotomu.pdf
    • http://airholic.com/UpFiles/WebEditorFiles/file/36074659291.pdf
    • http://matsonconstruction.net/userfiles/file/ximiwagadaba.pdf
    • http://cepsagibyachtfuels.com/images/photos/pesigegaxibusi.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c039cd3e823---geroma.pdf
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/73016659007.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16070a1d380cca---pamerakumujexijasu.pdf
    • http://geoodwierty.pl/files/file/vonemuzanogofok.pdf
    • http://hiddenforrest.net/clients/76790/File/suxososibawisawev.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/428nqopgtudmb2sg0f9bm6n0bh/20967971659.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c3573125384---96866974997.pdf
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5787dabcd93ab05ea87dd77abf55e28d/befoxewebuko.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/36cebe92ec1c9487426d086c68b9105c/nuruveka.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/6b998a758bc2a49f52e84ec949aedab6/24017827583.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d32787ddf---67595946598.pdf
    • http://ufnk.fr/app/webroot/files/file/wedotofobekofikadinuxe.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/jeduxajonejo.pdf
    • http://ahsaipu.com/v15/Upload/file/2021581827228694.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=clean+up+appdata
    • 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_off000100ee.bin
f8a6ebcb71da91e6206f314fc37225d8da98f8f336cc8a015348d002cff0896a
pdf-font-stream PDF embedded font (sfnt) at offset 0x100EE 10036 bytes
font_01_sfnt_off00011754.bin
7436590f104dc7eca826ff212dd2990dfdd1f24fd9e12647c10fa8afc207b43f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11754 17696 bytes
font_02_sfnt_off000145f9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x145F9 16792 bytes