Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d0dfaa084ae329d…

MALICIOUS

PDF

105.0 KB Created: 2021-06-28 11:38:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9ad48d2f08113e2a7845c71ac7eee2f6 SHA-1: e89bb2069ecd9e5fa646880c451447d6d2f067d9 SHA-256: 4d0dfaa084ae329db8d9b47aedc8354329daa98e7d64fa2a07835be46a1f760d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with several pointing to compromised CMS upload directories and others forming a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://augsburger-dartliga.de/uploads/file/27376963587.pdf
    • https://alihuata.com/userfiles/file/taweja.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/191371ae74dd9ba7e4177f04a50d19dc/dijefudurozoto.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780f5c53ad9---50188183855.pdf
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/xukevifapu.pdf
    • http://wu-pao.com/upfiles/editor/files/87949268390.pdf
    • http://aimic.com/userfiles/file/48189552898.pdf
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/l3pqhsiibfal3o8skngb3u2sn7/difiditesagerap.pdf
    • https://bursakaynak.com/userfiles/file/wopadalazewozufujub.pdf
    • https://aradmissions.com/ci/userfiles/files/puvofa.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c3d825163---solekajixojanuma.pdf
    • http://brkvinc.com/userfiles/file/86468262193.pdf
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/nesusojaputosewigot.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5b260cc59---33686443938.pdf
    • http://splogservice.ru/content/file/bejalaxafikuku.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/183gntmepo35s4sho6vhe3euhc/42100126962.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/padl3jn0khrsrnro06uclmohc0/26602034381.pdf
    • https://hifi-markt.eu/kunden/kronhardt/ckfinder/userfiles/files/nevefewevaribugikuja.pdf
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/e5119540a10a102141c63dc04a785cf9/demiduf.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf67eed279---90734649189.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8684e6051---zumejofupufezep.pdf
    • http://texasstatealphaxialumnae.com/clients/f/fe/fe72632f573fdc77cca6b85875c63e8a/File/wogakajediraziredinebafa.pdf
    • http://rheumatology.institute/upload/content/file/68701964319.pdf
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/19615444106.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/cae99a1c4f9e1e640810892c1d6a5ef1/35652975012.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+find+exact+values+of+trigonometric+functions
    • 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_off0001364b.bin
5ae719f1210453d79860dc6d9ec1b592e61ff45659f44a3edc89609d8e80cbf2
pdf-font-stream PDF embedded font (sfnt) at offset 0x1364B 11164 bytes
font_01_sfnt_off00015034.bin
473ddcdd14019c461067c8671bdc44e3d495ce82d9bce926c9e5123feddde9d2
pdf-font-stream PDF embedded font (sfnt) at offset 0x15034 17436 bytes
font_02_sfnt_off00017e49.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x17E49 16792 bytes