Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5a55dae1b200704…

MALICIOUS

PDF

91.1 KB Created: 2021-06-26 09:45:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6a62f9330f0ac3cbcac8990dcb5a878f SHA-1: 7f378980ad84920c4d55df6cc9f6a8f8898a275f SHA-256: e5a55dae1b200704978d2d34ac277eb28fe97ea8057c2a9c0a8fd211755fc3a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of these links aligns with phishing or SEO poisoning attack patterns.

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 https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/d35ab0f48beefe9bdc1ebc3c9050a02d/43358182166.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c0480c4ca---woliruzaxagetaxaw.pdf
    • http://z-i-f.ru/userfiles/file/savivafezomamotokaguresuw.pdf
    • http://wrtour.com/FileData/ckfinder/files/20210531_F35BCE8C83FCA54D.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087235c95ec1---puvusefedubarewosuvamilag.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078e030cdd74---33194047791.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/3489043e3f2190d5cfabde9c38268d7f/vogitejinurivixima.pdf
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/idn5m820cvdih2pbd4a0i312g4/satononukep.pdf
    • https://namratalakhotia.com/userfiles/files/zakewefiwu.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/304899f68c538e8607b6b3e3f0a846bf/fotubemuvev.pdf
    • http://jtour.vn/userfiles/file/38756959001.pdf
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/71518719209.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160893a788fc37---95605885617.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/8540cd977c33b1629a0dff9968313e4e/65087759814.pdf
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd0db64fd1---15111012358.pdf
    • https://aawyx.com/sites/default/imageuser/file/wixobazisakeda.pdf
    • http://studioambienteterritorio.it/userfiles/files/ziwetegusez.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2a2fc914f---femosubobow.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce86a07a5f7---47114268639.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f160a41bd---62414238622.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/2c8dkc72dv0ef1m7qel1bt10kg/vitalopozoxitobi.pdf
    • http://learnazia.com/fck/imagesfile/gokapumasixeta.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=technology+makes+people+lonely+speech
    • 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_off00010226.bin
749fc63a66abf6f07c4a0293767051539c7a392ef9730a2fab1318b412019371
pdf-font-stream PDF embedded font (sfnt) at offset 0x10226 10700 bytes
font_01_sfnt_off00011a94.bin
78ab2eb11663ee0181a9788c0ed6efdca540ce89d6922b6456947a7c27d99afa
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A94 17196 bytes
font_02_sfnt_off00014721.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14721 16792 bytes