Malicious PDF — malware analysis report

Static analysis result for SHA-256 99af07c88ce75965…

MALICIOUS

PDF

90.7 KB Created: 2021-08-07 20:43:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: ae12d4aad1fa226633da18e06f17d30c SHA-1: 07a43872241b9493fbc417c34062aa8766ac0186 SHA-256: 99af07c88ce75965d1be96ed0aa30029c6f1ccd71c8cd30e02d6c2286e01f2f7
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://chcial.ru/uplcv?utm_term=how+long+to+cook+1.5+kg+ham+in+oven PDF link annotation
    • https://alutat.com/data/file/84764505305.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/66n6rimjua3kau7hcfn5m8godi/lapirufifirogavokom.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/gexujiviretonerup.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/befute.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d3fb9316b---88555416439.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160897a8597928---50176568082.pdfIn PDF document text
    • http://eastmoorclassof1970.com/clients/4/43/4343e427eb1b0a0668350338a4d6b623/File/69278388448.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/76823816281.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e19b519d9c---81230284926.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9ace7fdfd---57933929475.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/21016529472.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16082b62198883---14686276313.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/rokut.pdfIn PDF document text
    • http://dogable.de/userfiles/file/81902798738.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6ae93d223---zefotab.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/87180381444.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7807fc4e4a---tasit.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/46700224883.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/sibemare.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/zefajufor.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/bf0847a904ad81e4f7a0d889a5f3b2ee/kuxekidafetunulupowilolu.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/fufol.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160d353771dc57---koduzesikegugodomivinude.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160acc70e68d9b---1046483107.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_off0000fc6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6F 10896 bytes
SHA-256: 5aa5d67aba70a8575bf01ca2768c2f8856cc9159a9b0193d9533872f88c9261f
font_01_sfnt_off00011595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11595 17248 bytes
SHA-256: 8d26057910d5de381778ac8bc956bcd631acee160b29c21fc76f8724fae5f48e
font_02_sfnt_off0001421b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1421B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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