Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5c04a1295039e66…

MALICIOUS

PDF

85.2 KB Created: 2021-07-05 06:18:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c05f00124e007933c27737cc552bf158 SHA-1: 74d244e00e0d1b83311b4d33b33a75a3d2fb84e7 SHA-256: c5c04a1295039e664fd8be7a84c82242970d3d635478703166d0a794ca3a41b1
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating it likely contains an exploit. Heuristics identified it as a link farm pointing to numerous URLs, many hosted on compromised CMS uploads and disposable domains, suggesting a phishing or redirection attempt. The document body was unreadable, but the presence of external URIs and link farm indicators strongly suggests the intent is to lure the user to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/5hvb9gfjana3177gedh5kav9g7/mikusebo.pdf
    • http://ippinnudon.com/uploads/files/4779422856.pdf
    • https://ferado.vn/userfiles/file/94558250210.pdf
    • http://flomojapan.com/upload/files/xowaf.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ac26ec19a---65476881306.pdf
    • http://farashimirooz.com/files/kigewiwibe.pdf
    • http://www.annaleehuber.com/content_files/file/wufem.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab63dd649d2---33025232132.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/22c0d292858bc26a8b7d3248b679ba5a/wipixufisavarosusewoxexil.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/ug2rrvrthgbcbsntrhga9o5m3v/57877251142.pdf
    • http://ahsaipu.com/v15/Upload/file/2021429659387004.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/9k0l38sgkpi82617kh21s6h77p/98094155072.pdf
    • http://ecohost.ru/pics/images/file/gasixuserorobakiripe.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e054ded761---gupijejelofumusapami.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d79a79a8c9---sidogapa.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/gm9vdrthh5h4mbep5obov3h47n/texatavanalavubozad.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a68c80d1e67---87102125166.pdf
    • https://ewastexperts.com/userfiles/files/99788098256.pdf
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/fj0ovjh3t3ua7cs8ovtsjuuegp/juposajalofoj.pdf
    • https://fidelishospice.com/ckfinder/userfiles/files/konifofe.pdf
    • http://strandedtattoo.net/file/jizibelojojewarexeb.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef3f9efbfc---bovuxalajub.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16086a4c33ebf1---41465106373.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=the+use+of+if+and+unless
    • 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_off0000ea01.bin
bd019821545f5b70ae6ddd944d1613cdff28638d47662ca70b2b8543f8422b69
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA01 10316 bytes
font_01_sfnt_off0001012a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1012A 16792 bytes
font_02_sfnt_off0001193c.bin
851465d13e403fcab057de3a597ac23192363ce822e0f0e36d95476fb7e37056
pdf-font-stream PDF embedded font (sfnt) at offset 0x1193C 17228 bytes