Malicious PDF — malware analysis report

Static analysis result for SHA-256 791cfcaad0d14fa0…

MALICIOUS

PDF

68.4 KB Created: 2021-09-24 22:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 866f80381b469106b84b93c73af37526 SHA-1: 32e7af399ea92d7b7b6ceb554f4559be1d68fb27 SHA-256: 791cfcaad0d14fa06faa32c1ff181a2148ff9b592be2393a9619a253101ba4fa
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and the presence of numerous external links, many hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the structure suggests it's designed to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://tims.ro/ckfinder/userfiles/files/77163568671.pdf In PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341e150a52c---wibiwotidosaxonebum.pdfIn PDF document text
    • http://ttc-investco.com/img/files/pefidopuzegad.pdfIn PDF document text
    • http://nhatrangpalace.net/app/webroot/upload/files/gokopiduwanom.pdfIn PDF document text
    • https://ms1oke.com/contents/files/miviwopeta.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/mufiridimidok.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/63086279235.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161369f0b1e091---48381067166.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/38238761017.pdfIn PDF document text
    • http://muszempilla.com/files/file/91921409173.pdfIn PDF document text
    • https://rugsdirect4u.com/uploadedfiles/file/37284227131.pdfIn PDF document text
    • http://talentfuturesservices.com/sharpinstitute/images/files/19009038446.pdfIn PDF document text
    • http://anm-av.de/uploads/files/mebat.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/2f0e5b0400fdc2c96c02639c61d5968b/kalikoga.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/nikanulezigarijebi.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/h9igk9ik02r73mhmr3ef83h22o/rekaxoris.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614b73dd00cb7---tujixuduneronifunawifodud.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1614359885b0cf---gufiga.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/petorenokikevaga.pdfIn PDF document text
    • http://srub-servis.ru/userfiles/file/dutiwopifokile.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614b558abe34a---75309753263.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/96011990554.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/92737831298.pdfIn PDF document text
    • http://seasonmediagroup.com/pic/file/guwamoxaxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=the+kissing+booth+watch+free+onlinePDF 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_off0000b05e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB05E 10896 bytes
SHA-256: 8d5475919a01ac3a9701a3f3e488d483397f68bf3cf9c9f73d3db0854d01d62a
font_01_sfnt_off0000c9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B7 13892 bytes
SHA-256: 0165bf9d651b7707c9ce2b6a05a5bd389cda08a28a9bb66021e67a53b8e3463a