Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2f566e796e5d756…

MALICIOUS

PDF

85.2 KB Created: 2021-07-16 02:34:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 40aa7e6acc66e1668cd568bd4b5326b7 SHA-1: 1190d9ba4218866c2b19f5411469e9654d660bb7 SHA-256: a2f566e796e5d7560376e4789cf76748d7864eec1779dfd00bcd17abed068c12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on compromised WordPress sites, a common tactic for distributing phishing content or malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious destinations, potentially leveraging embedded JavaScript for obfuscation or execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/11ad0122cafd08823584f0cad18c918c/16087339458.pdf In PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/80747525227.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/6001799313.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/48279411794.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1609271d550464---bagevanawukovosutax.pdfIn PDF document text
    • http://vhs1962.com/clients/b/b9/b967f936f519796c2a696a6ed1da67f9/File/wujusolorek.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/4b1af9cf3abb002e4a51ca2a50a3fb1a/lelotekebedepesowun.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/8494ba55d491bf310c8279d9284b1fe1/mepilabodu.pdfIn PDF document text
    • http://jucal.es/images/file/rozat.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/44868361667.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210710025616.pdfIn PDF document text
    • http://doverhighschoolhalloffame.com/clients/2/2d/2d76883e1086210ef8e2c43836b0327f/File/solaguvaravilevogeza.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/23950880668.pdfIn PDF document text
    • http://zonweringbelgie.com/ckfinder/userfiles/files/givedixup.pdfIn PDF document text
    • http://614move.com/clients/4890/File/jebutuvutijuxuro.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/bb1157ec405d09ea31d9a4b1a0a9799b/pelejavunurowowaliti.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/34854517786.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/8pdgrna4meksfeti6slb80723h/65518737679.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16080056d3d2dc---kujojirosegu.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/xaligusaku.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/d854365c5eb129e148b5275e4c6f62f4/fegumagatavibowonabebus.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/29162fd044035b30fa2e85d018b5f809/nujovekikojopipobunen.pdfIn PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/91952679957.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725e6252e1e---vuzutugogi.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160730c3f93cd1---77770462475.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/elpv084imalvqi1kpu7vc59n6b/43907041581.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=subcortical+cyst+humeral+headPDF 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_off0000eae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE7 16896 bytes
SHA-256: 75bc277dd5f9af8dfa09311578bb50157c3923a8d1d66ba6bf101a100ff2228b
font_01_sfnt_off000115e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E5 10960 bytes
SHA-256: 3f7bf9ed8063202370d768be7d6efc9d908e086447c559ea6c13e65763bd1765
font_02_sfnt_off00012f57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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