Malicious PDF — malware analysis report

Static analysis result for SHA-256 08e5a744c48bb173…

MALICIOUS

PDF

81.5 KB Created: 2021-09-06 12:18:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 56a3072a1b5793624971b569b73a79bc SHA-1: 148c1ab57d96988f212cba336d26b79d52ce9e64 SHA-256: 08e5a744c48bb1733df7c7ef8edea198d3d7c5ab2ff9290869716be7387a4518
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV and an ML classifier as malicious, with heuristics indicating it functions as a link farm. Multiple URLs point to domains that are either disposable or associated with compromised CMS uploads, suggesting a phishing or malware distribution scheme. The absence of executable scripts or exploitable content within the PDF itself implies its primary function is to redirect users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://jullien38.com/ressource/site-image/files/82655704103.pdf In PDF document text
    • http://teplolux72.ru/upload/file/95646123404.pdfIn PDF document text
    • http://954move.com/clients/4890/File/86020916093.pdfIn PDF document text
    • http://suacona.com/clients/16856/File/mefefowem.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210714131353.pdfIn PDF document text
    • http://bctlorraine.org/userfiles/file/92565223896.pdfIn PDF document text
    • http://sequoia60.com/clients/875776/File/8707830943.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/c8f1d6h0rk9u7lqsl1sfu61f41/56448821761.pdfIn PDF document text
    • https://odontologosmalca.com/images/userfiles/file/gaputinovarirajusabu.pdfIn PDF document text
    • http://ikra-ekb.ru/files/fckeditor/file/73091865257.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/0p2cg4v9h7a6a0gvo3fl8rht7f/81098730950.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/g732o1et7v7t1r2j17ct374ak1/vinolelevolapukiwezelef.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/vatijanaxexawewukeguwubo.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/22698211424.pdfIn PDF document text
    • http://brukbet.com/user_images/file/44266286222.pdfIn PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/zimubeturolajasite.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/tibix.pdfIn PDF document text
    • http://peusch.lu/userfiles/files/derumipumiwomunolemisa.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/15b962f9c5efb29032a1e8d920711f53/zosuziriz.pdfIn PDF document text
    • https://giasidaily.com/uploads/userfiles/file/bikepibuniso.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/xevilo.pdfIn PDF document text
    • https://tanthuantelecom.com/upload/fck/file/dizonima.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/96294462383.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/58193419008.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=manual+del+conductor+ctPDF 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_off0000dbc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC8 10196 bytes
SHA-256: d32334fbf3fa92b04a53312158008c54917f31b1ebaf8e93090f4d86ec9da07f
font_01_sfnt_off0000f2bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACE 17416 bytes
SHA-256: 1e120d25d2147cd66c0e13fe50bcc74006ab3a81ae285d5964dd45c38e9860ff