Malicious PDF — malware analysis report

Static analysis result for SHA-256 a84041f2abec18fc…

MALICIOUS

PDF

96.8 KB Created: 2021-07-07 11:52:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a55442a787e354349ce0834e30952758 SHA-1: 30f65ff91b55bebdff06549100aae18a1f0296d1 SHA-256: a84041f2abec18fc77ddf1b351ff033db8ef3701a38664b948360c532fcfae4f
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, indicating it functions as a link farm. The primary purpose appears to be directing users to potentially malicious external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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 http://robertfeinberglaw.com/images/edit_images/file/89388114550.pdf In PDF document text
    • http://studiophotosfashion.it/userfiles/files/rivavuvekisa.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfa0e8ac62---39566277550.pdfIn PDF document text
    • http://kinocosmik.ru/sadm_files/kozikekuxujuponibididod.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/fugikilelarazofanetotet.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/46572710223.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/kelesinajoxexogivuzepuguw.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/lenabedojeloze.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/mj31q7rdd1rtk2vrmetv8k5hvr/kabubatatomezalufebogoz.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f6b6dad18---nafiladalugemalazoxul.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/97f984d9216572a4cadd0d94004b8460/kubojowawopibafubav.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c59e9dd9944---kafivodizekafefukuwasojob.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/69659877683.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/230c6c116f48c7e55bc81dee622de475/38435802941.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/5anghmd1d2kcs6hqpj8lf40v2n/16571092883.pdfIn PDF document text
    • http://bichvan.vn/upload/files/58191640669.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/ximubekuxa.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086fdaa1b40e---fuwifofemu.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/59730572283.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/7ae3sgpi5e2n4nmvji3b03e4g5/gamokado.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5428def221---xutalapekapoj.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc1022f24c---nubijumofa.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/ml30hepcn9fptahbq7d1715pn3/wanakurubojutijubokog.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/wamirodobara.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=game+of+thrones+season+2+episode+1+parents+guidePDF 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_off000113c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C1 11212 bytes
SHA-256: 1cf2e5829a1164c695eb07be73407835d0261ff6bf0f9836c8c7a6439e94ec03
font_01_sfnt_off00012db8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB8 17508 bytes
SHA-256: facb278563566637a3338dcd84ed1db7b235fb07c8d45c8be777a517f5c8b952
font_02_sfnt_off00015ba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1