Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c018cf627221104…

MALICIOUS

PDF

71.3 KB Created: 2021-08-28 02:23:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 491a3bc93e142e12f2191f241867dc6c SHA-1: be1b76158b6957deb0c028ce6ee4a94c6f35a664 SHA-256: 0c018cf627221104af126de374134e52d04b85443795051f819e26dbd622b11f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many hosted on compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the link farm pattern are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://oniceh.ru/uplcv?utm_term=shooting+ear+protection+in+ear
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/16313338282.pdf
    • https://airshow-bg.com/file/33765506125.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/bd5921ef4863a1bb674cd284b82a577a/63474735598.pdf
    • http://abacusnancy.com/userfiles/file/69351674101.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607368e2428bf---26061381769.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6e1b21f55---zojunalewotugu.pdf
    • https://fruitssupplier.com/app/webroot/img/files/19380391069.pdf
    • https://churchofgodinjamaica.org/app/webroot/files/40334410211.pdf
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/logosojopebumu.pdf
    • https://kangaroovietuc.vn/webroot/img/files/26617596247.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ed8070911d6---lanizinagugekizumoku.pdf
    • http://sitoad.com/bbqjoekey/files/202108241116107185.pdf
    • http://gorod-r.com/userfiles/file/44496231250.pdf
    • http://getsolarnj.com/userfiles/file/49610896164.pdf
    • http://www.hangmandigital.com/files/file/sejasetozibo.pdf
    • http://sola-brothers.com/userfiles/file/75300901030.pdf
    • https://styliststudios.com/imagesTE/file/81640862103.pdf
    • http://meyergarden.com/ckfinder/userfiles/files/nofiz.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b74d7001c59---68422114974.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0e8770362---313579900.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8d75f3592---90249497427.pdf
    • http://duonglaohanoi.com/userfiles/file/19425839009.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16078403eebcb9---vurugijidigoxiwi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba58.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBA58 16792 bytes
font_01_sfnt_off0000d26a.bin
dd905ee888456160eb247f33161854572bdfcf7e85867353cb7b7476fc0d17a7
pdf-font-stream PDF embedded font (sfnt) at offset 0xD26A 14644 bytes
font_02_sfnt_off0000f756.bin
680d124593219484a7ba7a4852800af91d88613d10fe43e930228ba4d1549c69
pdf-font-stream PDF embedded font (sfnt) at offset 0xF756 10516 bytes