Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f09e3e5b526e247…

MALICIOUS

PDF

88.0 KB Created: 2021-06-26 04:44:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4dcf0d4fee2b62cd5e44d484e5bb50d5 SHA-1: 4dcd7c8250e87cc9e8c8d533372d94f8d396ce69 SHA-256: 4f09e3e5b526e247b6a4d1b043ed3457a4be115372a3dca3d2c2b78ae5f8ab02
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure victims to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://cructi.ru/uplcv?utm_term=linguistic+capital+example PDF link annotation
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/bae8c605380a9074bca24bebaf9f9f14/30826216588.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/a2dc989866a538bad25f027f634d1639/32620105263.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/4kf25rciccjsnnlkdih36c4cmp/mizitotejip.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/de67fc28f04093e9035a34a91e1b0d66/21444741631.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/75872456150.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/9e81f55c39bec4d24a04b1b224a0c8f7/dikeneb.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/387ba39b74cfdb1f24d7ca095d1884eb/xonipewijev.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/zijovodevuluzativagudi.pdfIn PDF document text
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/dagositovovokaxo.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/zixeziximigukegalesu.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160cd32c636289---rojidujoxunojenufagerex.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a88ba5488f8---mexiwi.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/c629df52f3e3ca21fde950d0efb1c07e/godoluwaxebiduvoxujamebu.pdfIn PDF document text
    • https://socohoteldanang.com/uploads/image/files/60455817695.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/87d6309ff334595d825e60d3d8cebb5f/gagezowogizeguwa.pdfIn PDF document text
    • https://hgb.se/filer/file/69436506630.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/vogixejojodavijatakafuzu.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/vukutumunefe.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d0be389d0---leraw.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/38b724e469a94eeb3c9f5c251df09feb/nimuti.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/1085317848.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d388e7f43---vexafujoboxulinuj.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/45470926786.pdfIn 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://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_off0000f63e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63E 16928 bytes
SHA-256: d822ba3c8deb3e90bbd6880ed3c01cbf3efd14f1f14e86833ac88a6857dd3472
font_01_sfnt_off00012283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12283 10656 bytes
SHA-256: 196d15f1a8e50ac23573c7e2e542a34d46251fe7e76153fc87e73a56ab5f5b41
font_02_sfnt_off00013af5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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