Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1e494d03a790f7f…

MALICIOUS

PDF

89.4 KB Created: 2021-07-31 15:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b67c6dbdbda768f759ae081cae9dfe0c SHA-1: 5d14733a4523bb99d3e3108cf9ae442e5811a82b SHA-256: b1e494d03a790f7fc93070c70204ad515496e345df3d64a04eb47b4a543feeb3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a PDF link farm hosted on compromised WordPress sites. The embedded JavaScript stream and numerous external URIs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution. The presence of JavaScript indicates potential for further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee2e80636d---woxorimovajavosunes.pdf In PDF document text
    • http://babamoleskine.com/files/file/30661424123.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/zajaferuradoluw.pdfIn PDF document text
    • https://nistd.in/userfiles/file/sezinigiluwijafexeditisez.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/js5qskc12ndulc3cb8ocbcqskp/zinusonunoxafi.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/pilokulobaberu.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/35991383887.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/99c427e3869b60521f6cb6cde0c7db86/16140040159.pdfIn PDF document text
    • http://irinka.org/ckfinder/userfiles/files/64486259674.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e14afb797b---49756916095.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086700347fbf---lovoso.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/21363965254.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e4ae63806ca---80043773397.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/42193947021.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210721032943135733617.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6df9949fc---45314014.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/bogimebu.pdfIn PDF document text
    • http://didula.com/img/file/jonefaziduwagemeliven.pdfIn PDF document text
    • https://kasihpaham.com/contents//files/1380602598.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c03a7dcf27---99001281418.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/8ca810980342daec95ee3bf86262622b/netubokogelomozigefax.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/77557213721.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160972c44ae001---mivafebudewotibepalon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=direct+rule+and+indirect+rule+in+african+colonies+pdfPDF 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_off0000fc6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6E 10712 bytes
SHA-256: 338a14a2772eec1b2f1a0c05c0bbdb02645125e6c0a311a78ed7dcc194732559
font_01_sfnt_off00011522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11522 16364 bytes
SHA-256: aeee0cae046b889387d8c0ded24a32d2da638cc29aab5bbe6e59dd81d4f26f5c
font_02_sfnt_off00013eff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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