Malicious PDF — malware analysis report

Static analysis result for SHA-256 434ddc931c295c96…

MALICIOUS

PDF

84.8 KB Created: 2021-07-08 10:58:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b2c0caa41f7bf7d40cc7c4fd9c0f20ed SHA-1: fc359e61b998cb3a6cc9358557c8d14914408f2e SHA-256: 434ddc931c295c96ee5627ea708bd62130b564dbd1407e6d10f0df2a08a1e749
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to distribute malicious PDFs or redirect users to phishing sites. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc16c0cd5b---lokokan.pdf In PDF document text
    • https://koratspring.com/upload/file/77606497883.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/ff32d162df6e3bf8b0bfaa3c7e366d0b/lorakimusevivubopux.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/3cf0hnrqi5r6if81mftcak0g26/33174396332.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/76934065191.pdfIn PDF document text
    • https://tavio.ru/files/file/renaleviworalaniguv.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/sanesure.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6ba209b3f---81842982727.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/91f68e6921f5359798449699853432da/kerunimewukegig.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/f053de54a870f8ee3e9850cf93bae3e7/9606746107.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/dopadutobemosopilob.pdfIn PDF document text
    • http://dentherapia.hu/files/file/41606595040.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/5c5ce1d7103fe0b0890b55e439b5a07c/fonob.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/potime.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc0b494705---69551136969.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/f7c1e28e323a36f2ff0e5b741a88a614/36518002804.pdfIn PDF document text
    • http://toanlinh.vn/upload/files/94182251774.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/44jh86j6jvm7v60hujbh08nkv4/75897444264.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/filot.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/8859289307.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160704d6a0acf6---pemonad.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160741acfdf629---lutaromibugajogawiga.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/bosobikikodisowobiromez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=trust+thoughts+in+englishPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100ED 17388 bytes
SHA-256: de77d63919755f61eabd94ba34f66fa1639ae8d61712d7316bd5e50c80169dca
font_02_sfnt_off00012d7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D7D 10288 bytes
SHA-256: 96720a92d19cc4edeaa9a16d585d5a4c33516e19d2f8ce3109b489b5943c4627

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