Malicious PDF — malware analysis report

Static analysis result for SHA-256 6319e26a37f20ffc…

MALICIOUS

PDF

73.3 KB Created: 2021-09-07 04:43:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a5e7f183d1a99bcc2dd589e95f7176ac SHA-1: 99f61568172372ad06416317cd4740cc2f4b6afa SHA-256: 6319e26a37f20ffcc11e86b540c523e13e2888063e62a40f4c44e54c16537514
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links to compromised WordPress uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The file's structure and content align with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://cructi.ru/uplcv?utm_term=ak+jain+pdf+physiology PDF link annotation
    • http://www.prieteniitehnicii.ro/documente/file/kekil.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///2021818174282110.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d584f50722---13722715423.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b54f8b0aef3---30205513609.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae51a7756e4---zebenewevofevonibiji.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/vitowafebukuwinujutoged.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/nb6j8ucs2vvl9n3336hpr4g5qd/74868559435.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/nemenalumakajimux.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/5729c5f52f30d66a26f57b7ae4ed0f19/dipev.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081703f4819f---tidilifuzolejaku.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/kekiwuvugax.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/7mevlcn9ggumlp7rtnqomfkjc9/69296187213.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ae6b5614fe---xebixuwijo.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c43d6dba7fa---74908410155.pdfIn PDF document text
    • http://wsm.hk/images/files/wapadazepavoxujufojejimib.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/xaturujufolujujuv.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f26145ce51---susimamuzijomilozenomexe.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/6fc265b1ec03ca8f82dba66b971ff285/jowoxaki.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/62499354869.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/7dba5a7db74d3261640308c9665b4e89/bitojax.pdfIn PDF document text
    • http://mosjob.ru/images/file/rabujevura.pdfIn PDF document text
    • http://upperdublin1970.com/clients/3/3b/3b2fb281f4756d03d37a29c41a8c1d95/File/lafoxil.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/51518582881.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/85b786e0dbe4e4f7151d694b6c24af60/rujumufoso.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/56590952338.pdfIn PDF document text
    • http://jedwines.com/cmsCart//upload/file/54408772825.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_off0000beb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEB6 15948 bytes
SHA-256: 4b976ebc5b024ce65bb1ead56419b1eee2f7dd6d981c70f40e67643dc4f3a80d
font_01_sfnt_off0000e797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE797 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAE 10764 bytes
SHA-256: 2f0d9b0c93616431b611ee19dd9633f964bf3d14cbd1a176ab701751173b25c0

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