Malicious PDF — malware analysis report

Static analysis result for SHA-256 a155694dbd5efca4…

MALICIOUS

PDF

81.2 KB Created: 2021-09-03 04:37:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1c7be61760b7b299be8810e380fec50b SHA-1: 19e59f5ec395dd7a8e82da452282b91b7dcde568 SHA-256: a155694dbd5efca41820331483b60248da5087bf6699233b06f24e2ee7fe75ac
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. The file's structure and URL patterns are consistent with a malicious PDF used to lure victims to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://garglob.ru/uplcv?utm_term=inventory+system+design+pdf PDF link annotation
    • http://pinxedien.net/upload/files/sepajemes.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/vidoxikosuwuxobaxak.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/51959920076.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/84j7l3ooni0v2o1v18s37amc12/89136007360.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee69cbbefe---kogibanoxaz.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/92843457265.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/95831961067.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/mosodizol.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c57e9619a---39604648364.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210826_113534.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/rikipoxu.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/wojilexolekuwevigagijode.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/99645834825.pdfIn PDF document text
    • http://girisimcilikproje.com/resimler/files/54975299496.pdfIn PDF document text
    • https://esz.jp/img/editor/files/68701361229.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/dipigaj.pdfIn PDF document text
    • https://menu2uplus.com/images/file/xuwujagalomovuvexa.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/wevame.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/827057218.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecfc88c102---jajubojubasiton.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_off0000da7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7D 17016 bytes
SHA-256: 3a664ef49dd35aa3f13dcd0ce32c254f22a50dd9c9c9198b5f849d63052258a6
font_01_sfnt_off000106d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE7 10764 bytes
SHA-256: d5ec4bc8ee4ab85620c5910bfc35cee990d97152dc3e3ae93fe9c8a0e2da5d85