Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0d52e1a46722e33…

MALICIOUS

PDF

83.7 KB Created: 2021-07-05 01:20:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ebb6d0c96f37dd0c0381351d8c82c4ce SHA-1: e1f5246a7c399089474b74649c6b7335fdd345b5 SHA-256: f0d52e1a46722e3335bcaba853000f142dcae95abbef7b3c82c8609e7379b791
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or potentially malicious websites, likely for phishing or malware distribution. The presence of numerous URLs pointing to compromised CMS upload directories and disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/27f7c329a10daaf62cfffb3b5e964aac/74974691455.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a2daaea605b---2227624731.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ede2ef351b---79190940997.pdf
    • https://vigiweb.cl/dinamicos/files/file/vitepikabetamaxenixal.pdf
    • http://alexhofford.com/temp/files/file/negaganijizaluled.pdf
    • http://nowyhotelik.pl/userfiles/file/45241443382.pdf
    • http://acpiindia.com/userfiles/file/mefuvavosekikabibon.pdf
    • https://haysalon.com/public_html/userfiles/file/wekerele.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5f974c048---kevojarativava.pdf
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/tubbfoqb4jmtbs1rp2jjanhftm/zobumufepemuxagol.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf83e30d41---79795072861.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4d1cf36f1---73698091279.pdf
    • https://louvre.lv/res/wysiwyg/file/mobalewuwadunexisomarakis.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/burewaxuxuwir.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160941daf300ad---wapit.pdf
    • http://babywagen24.de/userfiles/file/45297423458.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/41ee3e65678fcb92767b20411d9143cf/merobijux.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/8d3f34ec9c79e6c464add7ff909875a1/fefogezeroliwodakanuruno.pdf
    • http://goref.ru/files/file/23417107021.pdf
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/37a00f65200660bbb7a9430b75ba9dba/47286256051.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/qd6l9pflsc6sflmo07auok6d33/xibilifemivo.pdf
    • http://leinerpakgelatine.com/survey/userfiles/files/65594052947.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=xender+apk+free+download+for+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_off0000e415.bin
65cbf31367ad8394d560c898177b300c736eb98732d4531613a5265bd2e1eefc
pdf-font-stream PDF embedded font (sfnt) at offset 0xE415 10440 bytes
font_01_sfnt_off0000fbe3.bin
b98a621c8b2a909307a768193308042b2951d74309854aef5e90ebd4d1b9fbf6
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE3 17700 bytes
font_02_sfnt_off00012999.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12999 16792 bytes