Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f702aea35f35fc2…

MALICIOUS

PDF

85.4 KB Created: 2021-07-29 21:08:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: beccedf155fb790f492514664622ff40 SHA-1: 3852e61e255d166b731e2a928fb2a00647a16079 SHA-256: 5f702aea35f35fc2648bf27edce50b48fc17cea90b1ea54c7e296d324e2bc558
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://crewmak.ru/uplcv?utm_term=ghana+live+worship+songs+mix+download PDF link annotation
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/2basctj8botof8evjamb06ac0d/runexokaj.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/94598457431.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1608a92a57a664---60068918047.pdfIn PDF document text
    • http://venturahigh1967.com/clients/40640/File/rudebokukiludozuwovuxeguz.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/j173qnosb7al1jffse5kt8d1nl/42323592319.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cff6a51951e---wevavupotovarigatoxufe.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/1359128867.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/81371255072.pdfIn PDF document text
    • http://rcot.by/pics/files/medinurib.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/ansub759p7juh6dk025hhgodsf/xazewedazu.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/gefeti.pdfIn PDF document text
    • http://azizolace.cz/images/file/kasid.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/41521606785.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/78741053419.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b636aafd7---37116138998.pdfIn PDF document text
    • http://sclifeguards.com/clients/16854/File/78348231632.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/3764fc245141f5b2e61a904ac36fd5f9/zoritexonalom.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4432889448---nevonosaxadivukefepupogo.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16084c32e76b1f---lokibijixixukegiwimina.pdfIn PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/ruxobogo.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/cbea4ba5ab93e771331cb70f97b191b0/viduwafiwelol.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f536068436f---21477288603.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_off0000e4f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F1 18608 bytes
SHA-256: 75706f581a63016ad7286f24d77250dcb7d5b7cf9c337f9b0208196b47d1cbc8
font_01_sfnt_off00011623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11623 11032 bytes
SHA-256: a8327a3a2953100a149ecb538a3a917ff05bc20ce42ab9567598ca57303d84e1
font_02_sfnt_off00012f76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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