Malicious PDF — malware analysis report

Static analysis result for SHA-256 926f16f5334b23d4…

MALICIOUS

PDF

80.2 KB Created: 2021-09-03 03:02:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 43d012e6ef02e410cbc8c9423c45be11 SHA-1: 6da392f56c592a74b3c18e1b867473dca34a1fa3 SHA-256: 926f16f5334b23d4ac28d3ec7d69b646204d0d0a420534f106b8a1cfd3beb5ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by ML classifiers and ClamAV as malicious. It functions as a link farm, containing numerous URLs pointing to various websites. Several of these URLs are hosted on compromised CMS platforms, indicating a potential phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further suggests a deliberate attempt to obscure the true destination or purpose of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/geguberoponuzitid.pdf In PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a03eefd2d77---95458489989.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/j34kl7m26cboklrr2jcc65741m/gasuwavaserigixeresopuwol.pdfIn PDF document text
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca3b99b320---75613934786.pdfIn PDF document text
    • http://edison76.com/clients/5/54/54c13950cbd15a81e6fb4362eab8f273/File/bagarexu.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///9157682649.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/ruwitada.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/19295422372.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/d7e175926c665c327cc98927b774b016/lamisovuxo.pdfIn PDF document text
    • http://sieuthibds.net/images/files/2462273845.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/zekap.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/35005339048.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/nutilamave.pdfIn PDF document text
    • https://chpcentre.com/files/file/kegosemoboruji.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/8840005670.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/02e79e3ead97ef34a81b8fe896299599/57948516263.pdfIn PDF document text
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/pugubewubofunibi.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021053023424813.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/esnmvnukh546ph0sp3mgc3e065/93170028705.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/jagefujixapeleg.pdfIn PDF document text
    • https://coffeetuanvang.com/Images_upload/files/35175451386.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/xaforazoxukiduvadesijum.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9d1af934b7---69772102243.pdfIn PDF document text
    • http://ledson.ru/upload_picture/fupozomizo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=elf+on+the+shelf+free+printables+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0B 10716 bytes
SHA-256: 986da93d4375788bf2e0a859d04a78c1ed7fb050ef2efbe3ccd207223fc07347
font_02_sfnt_off0001054c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054C 18200 bytes
SHA-256: 7b22207791f8fcd1e700bba2360ea530affb5a5e2b4b08ecb413eaaa66669c9f