Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa2f9df04d91bf3e…

MALICIOUS

PDF

85.2 KB Created: 2021-09-11 07:01:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a4cc7ba4518adc12ce4b0d52dbaf7256 SHA-1: 710ef4f302c8b2fa45fbae3be98a283890f4a328 SHA-256: fa2f9df04d91bf3ec6059282efd9f129761dabe2b4585b8d712130ecfd67f81b
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple links to potentially compromised CMS upload directories suggests an attempt to lure users to malicious content hosted on these platforms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133dad39a594---91675149849.pdf In PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613446265f06e---61773185355.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/23844940053.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/85617543822.pdfIn PDF document text
    • http://fairfresh.net/assets/admin/ckeditorimage/files/tidawija.pdfIn PDF document text
    • http://thienthaopc.com/upload/FCK/file/xipivubalaruwov.pdfIn PDF document text
    • https://rajaunited.com/contents/files/polexunaj.pdfIn PDF document text
    • https://cubic.is/userfiles/file/fuvuletudaxebonag.pdfIn PDF document text
    • http://keramann.ru/uploads/files/lutipadawisotajazojalok.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16130cf0d8e7b4---newugapujufeva.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/51526985774.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/2936251365.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/161371acb5cba2---vinebalinato.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/4e60b82d8528b938c987f49dcb813050/ladaro.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132269697ec1---disolo.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/kumujijatagolo.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/zusebutejemekaw.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/8uqnsq6veb1vq707es8ojkiiis/84873653277.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021090907175373499.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/fenewuseje.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/6279080801.pdfIn PDF document text
    • http://tarnava.eu/user_images/file/75078249522.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/supowobilemolalexefo.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/84617620658.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=where+can+i+watch+just+mercyPDF 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_off0000e540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE540 19044 bytes
SHA-256: b4a745f0cbf9c5145789860e513fe10c7f980d8a2aa2996255ac39e0de8cb56c
font_01_sfnt_off0001163b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E52 10752 bytes
SHA-256: e07648849a4cddb6d12078839f7e312d4784caaf641afa0b15ad1b2eb55f5dad

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