Malicious PDF — malware analysis report

Static analysis result for SHA-256 39b8f184d2f15604…

MALICIOUS

PDF

73.2 KB Created: 2021-06-08 19:42:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: e49f45d14f35dbc5f98850a48d18a874 SHA-1: e8cfde3586bf4c69fa79e0a5f101d0807ba3ddad SHA-256: 39b8f184d2f15604e696a663c41fbc5271d59739c44081ffb1ce0f39bc923967
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other domains, likely intended to lure users into clicking malicious links. The presence of external URIs and link farm heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://infrive.ru/uplcv?utm_term=present+past+future+continuous+tense+exercises PDF link annotation
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef6bf4e731---53842300468.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160be2652cc090---gedisotorovozifefatop.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8add683e4---gunolokeruba.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/o4ickvkv6psdf9q2ccpnt63o85/29114907657.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202106060249.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/7f3c438bc7120b6b8fb54a0b9344abc6/jiwofulevuwa.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/fa7bbdo5d7f0u63jovvfc8udef/19454806685.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/jtiifmc662dch31n2a6pdemni0/75010519954.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/ce9459a0416edcac62b289a597f7f4a6/19011718587.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/1475334143608f560d445dc.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083162c85a2c---19206832679.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/78lbg3m4u520o6osck7a9ulec5/25200136087.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc56520ba28---xuzojinuwodozixobupuguwo.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16081123f756fa---7875160479.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/822293187fabac085fcf44d12d7b5a5b/91347428945.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/c4a6aa2133330dbcaa15075c1dfee0a5/32002659579.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16099a305d5703---8442923159.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/zelosopuketebol.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e14d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14D 5044 bytes
SHA-256: e92d672b48c03e20f5124962be2e7d768951bf443179c2365e1764605b962fdc
font_01_sfnt_off0000f28b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28B 10676 bytes
SHA-256: ecc00d246257a43a25b863de436a80360ae20304b127e194591f0c8740c316bf

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