Malicious PDF — malware analysis report

Static analysis result for SHA-256 4573e8e2c9e95057…

MALICIOUS

PDF

81.3 KB Created: 2021-08-28 15:01:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8353ac5276234c59cd390008d7b94121 SHA-1: 6eab93b359df8429129234d7cd6ffda5ee3cf1f2 SHA-256: 4573e8e2c9e95057852a161ba4138a6e1572c19f4ab6a56162bd46fd8aa6cff6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Forge Credentials

This PDF file was detected as malicious by ClamAV and ML classifiers, and exhibits characteristics of a credential phishing lure. The document likely attempts to trick users into entering one-time codes or MFA approvals, consistent with session token theft or MFA abuse. Numerous URLs were extracted, many pointing to compromised CMS upload directories, suggesting a distribution infrastructure designed to host phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://uci.ir/userfiles/file/95705301589.pdf In PDF document text
    • https://alternativecarrepair.com/userfiles/file/22989608101.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5f2e00a0e---sunumusabebora.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/98842401598.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608131214f582---pedob.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/ktat5i21k7jtc6jok19hvetqs2/96723313235.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/bipoxalu.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/mh5l97nj3a93e00i99hi6i3p5s/vikidanadi.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/78136018481.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/82637342959.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/fesaxuxafede.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/7757af545c437f6f580f433eddeb088a/waxotapitabaloniwixom.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/32cf4c3d53c080977c600ace33d5d3e9/54791230209.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083d1d14efe1---nedufevukad.pdfIn PDF document text
    • https://digireg.cz/upload/93304796554.pdfIn PDF document text
    • http://beytarimcilik.com/admin/editor_resim/file/51368847033.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160ade85fcfea3---jopaj.pdfIn PDF document text
    • https://auto826.com/uploads/files/kuratatulawukesif.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/65881619962.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2cc28ed93---70049986884.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=instagram+followers+without+human+verification+and+survey+2020PDF 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_off0000d508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD508 18056 bytes
SHA-256: b650642c0666125816bc0e7562403c549385cffed6e4d9880b919fb96c7515f7
font_01_sfnt_off00010380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10380 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B97 11484 bytes
SHA-256: a903ec4e7d66599ba937a7bcd42fd1c0e6c6eaf0e1b4042baf7feae1bf7238e2

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