Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c9f4c001850b10d…

MALICIOUS

PDF

99.9 KB Created: 2021-08-02 11:25:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6c93969682ba8496cc71dcfb5eb41e48 SHA-1: a405bff209ea98568f7c4d134cbf30403bb27da4 SHA-256: 6c9f4c001850b10d96a62c7c9129f451398a6d84c3a709f3baeafef5f87acb86
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or phishing pages. The presence of external URIs and link farm heuristics suggests the primary goal is to redirect users to malicious content, possibly for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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=ray+bradbury+the+illustrated+man+sparknotes PDF link annotation
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/78861e1af735427ecf2694b55619fcc3/vegabijilerovotepeluwej.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/vexawudizilimem.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/ddb836a49345bd208f29d44d72bb40cb/53700126825.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/b131fu8f2bia5sfe6i7j6sve88/63905642269.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/dixelaxidupidose.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/tudonozurutaso.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/7fcad4081965c65342b3b9d84f0d24b6/39621117633.pdfIn PDF document text
    • http://24cvety.ru/upload/files/karota.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/r9l9nbj7pho8fp7rjj6nt4s753/tuvurekomofivan.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc399a85711---6334251650.pdfIn PDF document text
    • http://pagyesa.org/userfiles/file/20210730171545.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/63979844981.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/91tg86fqnldoatfr0u9fmr0agf/67885251991.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/zulamuzu.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/c4ed5034c9d48fbed3ecaec2dbcad900/36618987763.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/74150370878.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/aebd8c75a4b7b5b13ad79deffde2447d/73608173706.pdfIn PDF document text
    • http://ghhs1968.com/clients/5/57/5762190d0a265df614d1f295a7060a42/File/84807856192.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/57486110826.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/87927863503.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/93864952052.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16081d418c5382---xakopilowojigezo.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/54726221259.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D7 11148 bytes
SHA-256: cab8f384540d7fc6c067776c8dadcaf308ffa1d1a28cca6c1d9fd65759b9338b
font_01_sfnt_off00012283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12283 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A94 16632 bytes
SHA-256: e896d0c9c6509c93731645541c0836c845742b74f7fde2e8ff5e94baacc6a6a0
font_03_sfnt_off00015221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15221 17252 bytes
SHA-256: cfde1f8daa6403288c4c1b2ebe223a0299ef836e0763e598117cc3807e9f4cae

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