Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9a9bd919f365731…

MALICIOUS

PDF

71.4 KB Created: 2021-10-02 16:25:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8e636086d26f403af1af38c08c3b1d9e SHA-1: d1990739d2851819d4025d73bcd2a63098bf6e5d SHA-256: a9a9bd919f3657317b23d7385202f31163183fe01fb1519ae59636523849ddcd
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and the 'PDF_SEO_DISPOSABLE_LINK_FARM' rule indicate a deliberate effort to obscure the true destination or to leverage SEO tactics for malicious distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://pistant.ru/uplcv?utm_term=how+to+get+unlimited+coins+in+mgamer PDF link annotation
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210912155056.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/30189902757.pdfIn PDF document text
    • https://eklyps.net/images/file/zidofofiruzupanegop.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/zorekidapuwebaxidoredivus.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/8352281237.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7791b91d9---77331901856.pdfIn PDF document text
    • http://chemicalengineers.ie/images/venirikizufevupedi.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/guzadowegajusowuga.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/67003288460.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/82609347279.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/pudakokoseredovadadomujev.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/64317706723.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/cul4r5pmengg8m6jk7dlek0bg0/piginam.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16142db6b1f8d0---13116211877.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155aed7cdcd9---zosokajaxivi.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0d98e2d51---50075654727.pdfIn PDF document text
    • http://bon-mar.com/fck_user_files/file/fikuwamajasodudu.pdfIn PDF document text
    • https://qnzar.com/files/nabimeg.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/mebul.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdb45989ca---54671496611.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/rumiretorufupeniji.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614684a28c109---56109645913.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/57329810025.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_off0000b4d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D0 10892 bytes
SHA-256: 85f8fa85165ddab4cae34483c34d6922796ae41e058fdecdce05db0d98fc1fbe
font_01_sfnt_off0000cdc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC7 16488 bytes
SHA-256: 27ed34b0ea39864448225745905659256436bf42d34c9976f5d71944379a00c0
font_02_sfnt_off0000f75e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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