Malicious PDF — malware analysis report

Static analysis result for SHA-256 4836bca8657fa7b0…

MALICIOUS

PDF

84.1 KB Created: 2021-07-01 09:54:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9f0950b2b76a7d54933da370b5d3e1ee SHA-1: 15d6b870c22470ca7dd9729db3397281dea76cb3 SHA-256: 4836bca8657fa7b08de06eb0df88e2b8569b89eeb89b13c1b4fe95fd34efdccd
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 numerous URLs pointing to compromised WordPress sites and disposable hosting, forming a link farm. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest the PDF is designed to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://myveolife.com/wp-content/plugins/super-forms/uploads/php/files/45dad1b15d1413727094f242f07e38e2/kikesavobena.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/140a3fff8f27f58f0ffaeb909648c8a9/77222585064.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/n3ed7fj3ojv6gaatnf91dg1990/mofivupidegojo.pdf
    • http://jjburgerut.com/uploads/files/wugudukifuzukenodu.pdf
    • http://pronobile.de/catalog/file/31171293422.pdf
    • https://alshamiltrading.com/alshamilfiles/file/sutepovipirejozoxaxetebo.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b902629c84f---67996333566.pdf
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/sufematunifixiv.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847eaf8e4f4---dimuzararizikuxuji.pdf
    • https://avonsteel.com/UserFiles/file/mobojivowavovifipox.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5854b5fd18---xatokinajoluj.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984cc627fa8---75839334964.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609db431184de---98886978648.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16084c241370af---xatixepadefenaronasu.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab821cf20b9---32983240784.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/bcfa45bf7f1ae9f4048547b9d17635c9/61038038013.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160942c0f49e29---rogut.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094181d36db8---70626674588.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ded815678---93352429409.pdf
    • http://bachova-terapia.sk/images/file/loridepeleporapigudepa.pdf
    • http://jhsclassof63.com/clients/c/c8/c8cc7cee7579ddcd469b669c0eb172d8/File/30788512047.pdf
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/wuvifogugezodosujorunabax.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b82a846ef36---40108301377.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=i+can+rely+on+you
    • 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_off0000e885.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE885 16792 bytes
font_01_sfnt_off00010097.bin
4ec9904f233ce80588370b67f9eb683a33a789b42eb3250c7833df5927622b75
pdf-font-stream PDF embedded font (sfnt) at offset 0x10097 17420 bytes
font_02_sfnt_off00012dc1.bin
ab283d31893a19fc278e93ca98298d649513143cf68ec93258fbc7e13a6c5c0c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC1 10032 bytes