Malicious PDF — malware analysis report

Static analysis result for SHA-256 a52c0b60c7394a51…

MALICIOUS

PDF

77.9 KB Created: 2021-09-16 04:52:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 766f2cbade419af5a7ba824e572f41de SHA-1: 4bca48781568170281457b186b43a461697593e2 SHA-256: a52c0b60c7394a51263d54b9c7f359178117a5ea7f291cbea4606832efa2bf37
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on compromised websites or disposable domains, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pistant.ru/uplcv?utm_term=john+wick+sub+eng PDF link annotation
    • https://pankajplast.com/ckfinder/userfiles/files/12526980155.pdfIn PDF document text
    • http://maremania.net/img_pagine/file/31870006453.pdfIn PDF document text
    • http://hzxf.com/images/upload/File/nusifatasosidol.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/80156244190.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1630510650.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/62919914117.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210908200405_01nnd1.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/20432276317.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/6ornnei95hn7jr4hn5idtqjokm/36269384681.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/114ha3gght66oiup0i9vvncq63/32534172093.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/98755800511.pdfIn PDF document text
    • http://newshop.jp/archive/file/zizuzizuji.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/64832139217.pdfIn PDF document text
    • http://barefoot.pl/userfiles/file/74766466072.pdfIn PDF document text
    • http://www.fdconsult.qa/public/uploads/cms_files/nenaseraxaxegofif.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/77136425539.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/b00f9ecdacd9410c13448acc6a14bd99/dejexoruwezivis.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/30019573451.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/4472619922.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613150e358e9f---nokizutidanerebow.pdfIn PDF document text
    • http://kk-gorenjska.si/uporabnik/file/92636063208.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/10575913743.pdfIn PDF document text
    • http://hyundainhapkhau.net/upload/files/93934765601.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/35913211330.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161409fd8d2e47---jafuditerixolatoferifa.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_off0000ced9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F0 10512 bytes
SHA-256: 4436378ec99a4532bedb29af4a45d6ffb77158c3519726937e8497bdff29e4e9
font_02_sfnt_off0000fede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDE 16712 bytes
SHA-256: 2e4f584f0622edf043da7a60bdee32da51f4a8742a7ebda064cd5258fbceec28

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