Malicious PDF — malware analysis report

Static analysis result for SHA-256 724dbc870cd1d739…

MALICIOUS

PDF

87.0 KB Created: 2021-06-29 09:20:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d31c8f4cd7dabe1e2909c28470d017f1 SHA-1: 1c7909db7e596426f0af0b5b89afe68a14f08f10 SHA-256: 724dbc870cd1d73902fdcec3f0479f0baec814e8f09c41b48e7c648b753b6d95
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, likely intended to redirect users to malicious content or phishing pages. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting a deliberate effort to create a network of redirect links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://laborke.ru/uplcv?utm_term=digital+copy+of+photo+meaning
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/097cdce62586308abd05daca7465de12/84936574590.pdf
    • http://amadpich.com/userfiles/file/37907336050.pdf
    • http://vds-construct.pl/userfiles/file/83669672600.pdf
    • http://allprintusa.com/admin/images/file/serudijule.pdf
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16073d5bb8b297---68620984168.pdf
    • https://jjcfurnituremaker.com/userfiles/files/37647503986.pdf
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/427622f26484ffa3d992afdc50765e10/beworadonanerofowel.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/cc7vq9ifadge3nq35bsj4jpt6q/jixipugemese.pdf
    • http://dabbleanddesign.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/marusuvonegapi.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16087e8480a638---zadimakiladegojutige.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/nenufomazodave.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b9ae71af9---tadusegozukaza.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a460e624e74---67159033191.pdf
    • https://medsplus.us/admin/images/file/xazamerobesivub.pdf
    • https://pima-alarms.net/slicice/file/dewenatasawekabivibuxi.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7ffa1bf97---xebun.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/b1f97cd0f6005b4185cd72dc5fdbdec3/dazel.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c944102a88b---xilofavemusudenefa.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/fd5398405a5476222d0de0298ec33e5c/tibexuku.pdf
    • http://astro2sphere.com/admin/images/file/zebidamemapegavoke.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/6b017d264bfc8ebbb8c3503c3941626a/kikopatadukazow.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/009377f1a9d3f52275beab9c78560b37/valudigifami.pdf
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/7e26e0f69020f0dc7a0e7112fe90af09/78617567749.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_off0000f1ce.bin
6e035f7bc694341a1cd3787f242936e67a685a651a4eb6b35f310c082e9be62b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CE 10772 bytes
font_01_sfnt_off00010a7b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7B 16792 bytes
font_02_sfnt_off0001228d.bin
ca1e2f653468083f8843ee1125623e43751a8686df9f6507f588a46ccae50995
pdf-font-stream PDF embedded font (sfnt) at offset 0x1228D 16980 bytes