Malicious PDF — malware analysis report

Static analysis result for SHA-256 77041d4831cabed3…

MALICIOUS

PDF

76.3 KB Created: 2021-07-21 08:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: db222bfeae3a18c472fc28b16f35b35f SHA-1: ab4aac3e2d094ef7c19bb1ee3baae71394def9b7 SHA-256: 77041d4831cabed3cfb563ef01f2b8363bd9f328003e3900210685d1fc2c916d
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories, suggesting it functions as a link farm to distribute further malicious content. No scripts were extracted, but the structure and URL analysis indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://mosconi.net/userfiles/file/tagesuvusuvifexas.pdf In PDF document text
    • http://dermaktif.com/imgup/file/62619311882.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/a9680ee2b4c5421947e2d761bc396e5a/46743245912.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a59a2fe9b5c---83725908972.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/8510219c8d717a84762147a516034917/rizolowiwelepipilezekaxe.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c5c6a6882---tilugujavuminorizanelos.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/8f0f815ebaa84381f009314767676a34/34327726726.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160bc69be9e5d1---75462394463.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/9153536784.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/21000958971.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/q2ce7shgkj5nv8r1uaf22fisas/80463377117.pdfIn PDF document text
    • http://ongnuocdenhat.com/upload/files/mitumolalizotebukokujekod.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/0npc6bj0510tgqnltduvkrdkk8/59289384091.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/15164918189.pdfIn PDF document text
    • https://printsolutions.ro/uploads/wysiwyg/files/45251489558.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160853b6b3fb9c---34023376140.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/pasujenifunukewunititok.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d54eea473b---63830411874.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/28858827089.pdfIn PDF document text
    • http://donghocasiochinhhang.net/uploads/userfiles/file/pawenifak.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/67620945268.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/1ad63b5b84cc7bb814918156d8b63f64/nosopexulilidepekojolaso.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d6cb78cd8---70480883144.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/a0cd2b193172ddc792031861f62b4a0c/78572435990.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=yam+yield+per+acrePDF 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_off0000c9e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E4 16500 bytes
SHA-256: 97fb923690c570750cdcc6cee8555e7303665c8e75f615d63e5102dd13e72488
font_01_sfnt_off0000f4d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE7 10280 bytes
SHA-256: b07d860a66656f9d809a85220db66a09a49e9bee917793513c7c576d0d31ab7e

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