Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fe1e6d131b9bc38…

MALICIOUS

PDF

88.9 KB Created: 2021-08-14 02:01:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1c2f01a0796aed9767c16d480f85e92f SHA-1: c05a81cdf22bd9def40a3518cf5e3e855ccad6df SHA-256: 9fe1e6d131b9bc38587d3408191335288ff860ea6eabf88c110e0e2d558f1359
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The document contains a link farm pointing to various domains, some of which are hosted on compromised CMS platforms, suggesting an attempt to obscure the final destination. No scripts were extracted, but the presence of numerous external links indicates a redirection mechanism to a malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://nomylo.ru/uplcv?utm_term=early+lease+termination+letter+sample PDF link annotation
    • http://polyacer-ecp.com/userfiles/files/20210629_041106.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/eea722a2867dc98105dddd201780471f/79974397463.pdfIn PDF document text
    • https://vijyaiprismcrm.com/userfiles/files/mewupowixadalaj.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/jizizulezuvogusuwe.pdfIn PDF document text
    • http://wfuchiomega.com/clients/4/46/46a815049f9cfb11ab63b386d19cdfb8/File/88699856015.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160edb36413b20---9669632663.pdfIn PDF document text
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/kazekipafabipe.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210704155011_vrbrgl.pdfIn PDF document text
    • https://greffedecheveux.center/upload/ckfinder/files/vofis.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e905c9eef38---zumujejub.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/11659413095.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/0d2bdc910c5feccd8633221578e2c9bf/41248727431.pdfIn PDF document text
    • https://vestol.bg/files/file/41891196236.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/5585128474.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/mobarewudirisonagixe.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/23026995017.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/a8ea5997a0451e05c63b8d19cd97e539/zulafofowakepewo.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/76070ef0cb42ec81587477f1492a499a/29051566221.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160898c1a87132---83516640639.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609839f08ee1f---77492301120.pdfIn PDF document text
    • https://go2germany.ru/files/file/verurukonuturijub.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/gijevib.pdfIn PDF document text
    • http://icsbc.ru/fuploader//file/23456739117.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_off0000f721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF721 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F33 17192 bytes
SHA-256: 5cdd5f220f91655428084c09ba3a3f920b8cbd19a2689b888faa125b39f448d0
font_02_sfnt_off00013c45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C45 10508 bytes
SHA-256: c957d6056376d91a582f0b94bfce2dd9573f16df76e367b85bb96463cd5aa3d1

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