Malicious PDF — malware analysis report

Static analysis result for SHA-256 250577296504f3df…

MALICIOUS

PDF

78.2 KB Created: 2021-09-18 11:07:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d77367c31d984c536cf7880f247d9622 SHA-1: b0f634dc05acfdf3bd77fac6ac3ddaf30cd45857 SHA-256: 250577296504f3df1c2c9e8882be39a9e0c04e76ec55e6bacf8c00ff173dfa59
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, many of which point to compromised websites or disposable domains, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://cructi.ru/uplcv?utm_term=tara+mira+full+movie+download PDF link annotation
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xobezudutal.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/65101436667.pdfIn PDF document text
    • https://umiyawoodworks.com/fckdb/userfiles/file/futati.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/57022545472.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/dezol.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f588d7746---30895764067.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/54773438592.pdfIn PDF document text
    • https://forssh.com/userfiles/file/mibojo.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/piwurosu.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/i05ob4mo0vddvh59ragu3a2597/zugepikerebonevimi.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/puguxoridivofejudorewajan.pdfIn PDF document text
    • http://dominant.name/userfiles/file/37123186956.pdfIn PDF document text
    • http://jonme.net/ckupload/files/nugokol.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/73193371766.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16313381618748.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/komiwafajefukugop.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/61179988899.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16142cb5473762---zomefurivivomexijad.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144649518a32---36485293688.pdfIn PDF document text
    • https://euinsuti.uniluxgym.ro/app/webroot/files/userfiles/files/6699182719.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/xuwobebak.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/92887515848.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_off0000cc05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC05 10464 bytes
SHA-256: 9eadc69415b05dd8c447d8056ea4e4ac7750d168dabb9c87bb21ac971bda7e65
font_01_sfnt_off0000e3c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C0 18120 bytes
SHA-256: c3f8773cc7ec131714404ce306067081df3eb04e6882fc7a16315d1e243fd6b6
font_02_sfnt_off000112ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1