Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e6fe5f0faea73fa…

MALICIOUS

PDF

86.8 KB Created: 2021-06-27 11:31:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 50308ae26c8eab3dfa63421735c6045b SHA-1: 36f5dae62dd244959636fe7420d7f035306e8cdc SHA-256: 7e6fe5f0faea73fa52120483f2c3307879c0d74b3c043c98b92c907dcb0c9a63
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. Several heuristics indicate the PDF is part of a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://gancza.pl/userfiles/file/wixam.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607749584ffde---16864115984.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744ca12339d---fumekanasadimaji.pdf
    • http://ajtoablakcentrum.com/_user/file/rotajaro.pdf
    • https://ivaco.it/file/11637228867.pdf
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/da1ls9qt99spkr2hjqp9j2i6mv/9666291996.pdf
    • https://sahodayabbsr.com/test/fckeditor/file/lijozoduje.pdf
    • https://anmimar.com/royal/userfiles/file/80552399521.pdf
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a8d9022caf800af4a421117a06b6c3df/vorunuvu.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16091bae5006e6---wusokox.pdf
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/8a410e572e24b7be2f58465c8cd4acd7/manebifiwi.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/f12qhlis6242f0iujctnq098dg/89571890213.pdf
    • http://dachastyle.com/userfiles/file/rulenazorej.pdf
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/doxujexum.pdf
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210609225515749355lyangv.pdf
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/p2i4qsil1l7osurove50a099m9/lebatiwewe.pdf
    • http://anvlaw.com/userfiles/file/38407002781.pdf
    • http://web68s.com/upload/files/42544737187.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606fed4170cf6---89605454719.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076c968b3b26---gotezafis.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8520e9a57---4812896623.pdf
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/vjra1lr0h08s5e2astre85f5js/sobevowasepawafitonori.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/4235796794.pdf
    • http://skrabl.pl/www/rpbd/fck/file/71710017734.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=solve+for+x+of+a+triangle
    • 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_off0000ef7f.bin
a833f4134837c78c4c3bb1d536ba1109cda6e7979ae552cd88a376f7ec0eae0c
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7F 10464 bytes
font_01_sfnt_off0001076f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1076F 16792 bytes
font_02_sfnt_off00011f81.bin
9050800206a2d2b8ee64b7ad8f3551ce744e452bed7087b8c8fa3d977dcdd121
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F81 17764 bytes