Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea303c36c32bce16…

MALICIOUS

PDF

82.7 KB Created: 2021-07-15 10:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 23ac6043af3a50759b66318844f846f0 SHA-1: 3f3ad5752e0d7eb89eba8f052cdc54b69675da3f SHA-256: ea303c36c32bce16fea4fd26532ac0e5ba8450479ca099eba03f33b2d735e4c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of a link farm designed to obscure the final destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, suggesting an attempt to evade detection and distribute malicious content. The presence of these link farms strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://huntic.ru/uplcv?utm_term=supply+chain+management+ppt PDF link annotation
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/ac134f7cce7a5d6f58165fd94282e6c1/xajirub.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/53472395720.pdfIn PDF document text
    • https://vigiweb.cl/dinamicos/files/file/90851956512.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/42579349732.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086ab5f2871b---kimepezudigaz.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/101582cb0183311871bcdf0e29a678ee/ledudujanomar.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/0ae3f9c3590a087b98b809b09e5a27ed/vuxov.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607f10e856757---9057034192.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c5882099a---maxofujoxitu.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/girosaxudanumagobefa.pdfIn PDF document text
    • http://fitviewer.biz/files/file/22679334272.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/71303669730.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160780bace51a3---34379163904.pdfIn PDF document text
    • https://vietfun.com.vn/wp-content/plugins/super-forms/uploads/php/files/iooo31u6g4cgfdaoaitobcuv5o/vevida.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b09c7e4d30b---62922332946.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/20215121337117497.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9b3334bb8---tijusitiga.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c3a8ac649---wenez.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/jaxarix.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/55269045593.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/72605539356.pdfIn PDF document text
    • http://webelievedin1984.com/clients/6/67/676624d6593aa512bfa6e10e765af00e/File/desor.pdfIn PDF document text
    • http://bowlinggreenhsclassof66.com/clients/b/bd/bdf8ab256cd88a603fc2b95a051c5839/File/75462296423.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_off0000e243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE243 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA55 16480 bytes
SHA-256: 86c1b13f394cfb35e475539c3fe58f67b1b4d98c2f4bdd05bd6147df2eebbb1b
font_02_sfnt_off00012522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12522 10724 bytes
SHA-256: c00abba33b935b77a1bdb33e48e5b37b14ccbf235fc1ffde4fa9d9031f24f59f

Open this report in the interactive analyzer, or submit your own file for analysis.