Malicious PDF — malware analysis report

Static analysis result for SHA-256 02bd73df22718616…

MALICIOUS

PDF

82.7 KB Created: 2021-07-27 05:25:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a6aa39f8c29b54b5f8860dfbe0be60b9 SHA-1: 778ae08859116906d2a4eebcfbcf120244960cc9 SHA-256: 02bd73df22718616fd49c8b6bc07a6fc546dbcba4ca287a3b269cf17fbe8a4f0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to various websites, some of which are hosted on compromised CMS upload directories, suggesting a distribution mechanism for malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download a password-protected archive, a common tactic to bypass security scans. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://smithandfriendsfamilyreunion.com/clients/d/d0/d05d9bb0b75700e7199fc64e52c62161/File/15174119422.pdf In PDF document text
    • http://chinajnbt.com/images/upload/File/96617810683.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160816b6b204ba---vajumozexijujim.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb867ce4364---99622086205.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc80e56669---wilowotukes.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/05/10/file/20210510_122659_170.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2bd8507380---lorewepamezilaboxoje.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a0aca7fc6---86604057084.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/faluj.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/959884c1ea0e456908a50553c437a847/34326982026.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/dba61ff5cc20ecf2d89240456c7faa65/mitupiren.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210510130258423.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/85db283c817c259c9ccbb317a3e9cf24/vatugalupesene.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/79214977150.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/ede337071386171c772cc582e6da7356/73966844438.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16086dc9b803a5---55780864065.pdfIn PDF document text
    • https://rajatotogroup2.com/contents//files/salovilowewula.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf86fbba06---zofepemixatenedomuzit.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/96523132821.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/63879302f9b17a1f9c82957ae076d5c4/51444481625.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5547ee5636---94095422378.pdfIn PDF document text
    • http://bio86.fr/fichiers/76957001532.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c863444d1af---pukezofunutezidetazelura.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=como+descobrir+senha+de+wifi+salva+no+androidPDF 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_off0000dbdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F6 10964 bytes
SHA-256: 2c0da765fd88f1bff6eef6ac6f00d2c20fb88441827e222a3f5ad09fed939556
font_02_sfnt_off00010d3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3A 18840 bytes
SHA-256: 18e24a032ecf51797e48d0fb5ae527638af3ed9b00b9333137d32470beeecd92

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