Malicious PDF — malware analysis report

Static analysis result for SHA-256 0463872971362c85…

MALICIOUS

PDF

84.5 KB Created: 2021-09-06 22:13:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 09f4e920506c4f8f5f5632d8f131f2f1 SHA-1: b50e39ca79c12d6e0fa2528ce0cd305aeeff809f SHA-256: 0463872971362c85fc2449af62848119baaf143fc92b36769b9472429805594f
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting it's used to redirect users to malicious sites. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://vyveva.eu/UserFiles/File/74855989247.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160db9d8dc5e56---50944403762.pdf
    • https://okazdedziecko.pl/_files/Media/file/92258775704.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16077a170cba9d---rufafowipaxelevu.pdf
    • http://agisma.ru/files/pages/files/62615220689.pdf
    • http://luxmeterthai.com/ckfinder/userfiles/files/mulikofamozexixojezox.pdf
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/0d5a27c0eb71344cb6d9973ea451d2f8/laxigumadudakapaxev.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c7014629ce---318897777.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba005f39681---7071286243.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1d85aec8e6341570f394d58632d35d90/98899070527.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/d667cb498e286c44bd301b3701745ba1/rukumivexivapajatafa.pdf
    • http://jgbt.us/pds/userfiles/files/novefuzuzedoximibig.pdf
    • http://urbancollab.com/userfiles/Proj_Name//files/94003211585.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa788fadb0a---teseriterisugeju.pdf
    • http://logiccpacma.com/ckfinder/userfiles/files/49104021121.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8864b63878---rezenoviniteluparawiguj.pdf
    • http://lawngo.net/fckfiles/40888125818.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f857b2da2---kiwugesebexam.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ad8b3f801---nugiv.pdf
    • http://bernardthevenet.fr/ckfinder/userfiles/files/76925451703.pdf
    • https://bhsbeacon.com/FCKeditor/file/7907529440.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160c66e83e8f4d---49120330044.pdf
    • http://neteyes.eu/editor_up/lakelokef.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=bell%27s+palsy+exercises+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_off0000e70f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE70F 16792 bytes
font_01_sfnt_off0000ff26.bin
90ebd7dc313f7df69a9abdf813dd963d095a315b9dfa9d2b8e6e5e52b102ba8d
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF26 10596 bytes
font_02_sfnt_off0001178f.bin
d571c98461b467ca55a14a5efe68024a2c0101ccdcbec7228cd4420c76073d8c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1178F 17464 bytes