Malicious PDF — malware analysis report

Static analysis result for SHA-256 fec393023560c6a1…

MALICIOUS

PDF

105.5 KB Created: 2021-06-28 03:05:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9301599e3a38c50aa037d463f016a19c SHA-1: cced2cdaa78e5f746c284397ce4468340deaf4c6 SHA-256: fec393023560c6a143f5b5964d81757e5e614f2c61dd354fd4754603cb050284
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The document body is unreadable, but the heuristic firings point to a malicious link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/c395df29c5a22f7b5b57e8b2896fe559/51928326680.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b815985f93---18353587716.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/gk7cmaqpud6vkmv4jcif2aj49h/jodewagobifilosedovizuk.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6dbced0ca---73349853714.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/49fb654de6d4f15932644be2727d8be2/depazufe.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e74b725f8d---21090724597.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a04a7a90e---sadito.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a38a30343f9---64675021787.pdf
    • https://angkortaxiservice.com/userfiles/file/7511281799.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607366e163116---lugij.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609490f2391a1---20828445589.pdf
    • https://arichaindia.com/userfiles/file/vemagizizevesosunu.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d66792315f---vodozapirevezut.pdf
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/d205357ab6baaae5a10c5b3dfc62361a/vosurod.pdf
    • http://cymrozgreatdanes.com/clients/1/1a/1a407d8ccac5525c71aaafb6b4664123/File/temiwelekirotojuputufit.pdf
    • http://viprealestatebrokers.com/userfiles/files/vegunuludodadonubenit.pdf
    • https://pmms-online.com/assets/file/31012447195.pdf
    • http://novichiha.ru/pic/file/4105609604.pdf
    • http://jjinline.org/file_upload/file/xisisifilik.pdf
    • http://beiwendq.com//data/attachment/file/rorexejokorelasom.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0314a6f6f---42930373689.pdf
    • http://alpanelektrik.com/depo/sayfaresim/file/24191728575.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/41c16d7ffc3ea78baf4126f5863b9a45/vunof.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0ba4ce842---99889196158.pdf
    • http://svatba-emi.com/uploads/pages/files/86231640578.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=fabry+perot+resonator+cavity+for+a+laser+diode
    • 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_off00012fef.bin
cb35564983dc8c0346334a9858a6d5a68299b6f9b2758e631a4eb6aa310efd45		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12FEF 20628 bytes
font_01_sfnt_off000166d3.bin
0fd022d070cf0b92a3032cdc1fe027e8570d66e7c3d2bc1156a90d1d33869f9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x166D3 10908 bytes
font_02_sfnt_off00018009.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18009 16792 bytes

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