Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab1a674f88a0b3a2…

MALICIOUS

PDF

88.4 KB Created: 2021-08-02 18:51:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 0194ccb6becd649bee6d8e144e70348d SHA-1: 34b581f644172b8a8a288970c3650085cf2d2abd SHA-256: ab1a674f88a0b3a2c7dbab2c04e8b9e62a1be473690dae69ff07458df26eadf1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm pointing to compromised WordPress upload storage and disposable hosting, with numerous embedded URLs. The document body is unreadable, but the presence of multiple external links suggests an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://infrive.ru/uplcv?utm_term=destilando+amor+capitulo+150+parte+1%2F2 PDF link annotation
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/1k0n1b8nqi425chhk25mcim0ld/55523209859.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ef652331e---53756311138.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb30fda265---zakub.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/aee85b3b59b435f9c73a64338555cccc/xaraduturetimamopoki.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b2a4697aa---nivimakujotedasujur.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/bcab7eb68871f28281beeea1e8ce87a3/liguzojexi.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/20c95b89665aea13923826ad8d9d4b3f/nujotazigojagoto.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/1b9d33083523096820f81e25e673d3d7/saduzuwafabikok.pdfIn PDF document text
    • http://chicohigh1987.com/clients/47015/File/nokuveke.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9b54a7cd9---82530052187.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/digoxufig.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/4c8cd9c17b237d33c50dd6c28a0a4705/nosegedefi.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/c2ba9702e741d90c9ad75154fbce5f46/duxupaxenok.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/b9d822fce2647943a2845594f447a00b/modepurosuge.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/51436533885.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/senaludu.pdfIn PDF document text
    • http://barnesfamilyconnection.com/clients/f/f3/f37d50667a1bb99e511e26172889fab9/File/33893133730.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/kuxesodobedal.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a733d76b470---15650470260.pdfIn PDF document text
    • http://superplasticizer.cn/d/files/budepamamoxogatud.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD328 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB39 16944 bytes
SHA-256: ef0329dac4803480f2d6f4d9e9c4ba3aed2817dbf0857a17f9b8becfccd91a33
font_02_sfnt_off00010287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10287 20908 bytes
SHA-256: af211d7a448b3e2bf72ffaa95f5bb71ff421f5b35b43cb282ca1ad81d81d7621
font_03_sfnt_off000136bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136BF 11240 bytes
SHA-256: 865274ffd754efd36639265de14a591bb64a8e8d044cc8cae7a9f1fd088778f0

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