Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ea9c5e2afb1e189…

MALICIOUS

PDF

89.8 KB Created: 2021-07-29 16:52:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fc8be0cf7bbcbec82135cc01ad034f1b SHA-1: bc594ddf4fbef342c4be51f812a8fa38ca92fcc7 SHA-256: 3ea9c5e2afb1e189b1bd78d955d5586a11ece13eed13821b3f02f6983a7d1634
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as a link farm. These elements suggest the document is designed to trick users into downloading further malware or providing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • 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.
  • 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 https://laborke.ru/uplcv?utm_term=call+of+mini+zombies+2+mod+apk+download
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813812ed0e0---xugogibe.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5f0a6a943---400535097.pdf
    • http://dailyxedayhang.com/userfiles/files/surakalivig.pdf
    • https://securitydm.rs/slicice/file/lekidavixida.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b2fb6b3da3f---lurixaxuvozegeb.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/kdhdstm50ueldcskpcflut20ke/5309423601.pdf
    • http://market-oborudovanie.ru/upload/file/15525973596.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/83406a0aff7754f8b9575be5fd52325c/24425956583.pdf
    • https://alev.az/userfiles/file/denawazodet.pdf
    • https://alshaabcoop.com/userfiles/file/26857194578.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/p64760p8m52vqkd05l3kldg48u/51844890079.pdf
    • http://wjvanderheidedienstverlening.nl/uploads/file/98011244691.pdf
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16077b117a33dc---19526133174.pdf
    • https://newline-eg.com/userfiles/file/20597863670.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/bfe41460e7d3c479ffd4b6dab4ed1530/23168330589.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160718960eb4d3---sipozogujevivaxikajiwegi.pdf
    • https://sealskinz.ru/files/file/31019278857.pdf
    • http://hotechike.com/files/files/18312363008.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bd7d7ada8---takajemobutexaledozegip.pdf
    • http://brilspa.ro/userfiles/file///buxuradowapugixid.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc117b8d75---tewosajufe.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071cba1c1a42---99749955323.pdf
    • https://newchat.xyz/js/ckfinder/userfiles/files/51196774337.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_off0000ef06.bin
7cab153525cc1dfba35d7a50ecf2e038dc17df6c0a4db3f3556d5a20d7428f79
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF06 21564 bytes
font_01_sfnt_off000124fa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x124FA 16792 bytes
font_02_sfnt_off00013d11.bin
b144c0403ea17f80abe4020572d9bfb903b059bbda2ffbb5f125246a6b706a85
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D11 10988 bytes