Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b8dfb974b4441bd…

MALICIOUS

PDF

98.2 KB Created: 2021-06-25 21:54:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 896e4858d6cc8693c89b3c9924bdf322 SHA-1: c4283bdeb1cce238e3c54247d866395257d6c791 SHA-256: 6b8dfb974b4441bdc3eb66fbd2c8afdec7c07a1bfb613e9f2b79027f5f91ba6e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, pointing to multiple compromised WordPress sites hosting PDF files. These links are likely used to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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 http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160afc44f6a1b1---gaxulolivovuwefumetagi.pdf
    • http://miraesusan.com/ckupload/files/nemekuvodixufaruzugodora.pdf
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/339c588940f6196f9562507127474952/xukufizinorewaluzuniw.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/u8j3jbuar2ka3mm1rlgb36kdl1/91570914621.pdf
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/n6nv4kij0f6h91snsidrcjo6q6/8735115758.pdf
    • http://murielbellhomes.com/userfiles/files/45811052364.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/1a1277086cb59ec5ca93675c00e13ca6/wazofezowiwagevamig.pdf
    • http://drive4smilesquebec.ca/clients/f/f5/f58105ca183540932673f5bf18e62671/File/tuxulanasosudenovuni.pdf
    • http://mega-gold.com/userfiles/files/16500388831.pdf
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/22f8a6fcd5b72962826cc6cf092f4e4e/fuxojetipalevugeginife.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e674bceb7---defigebofeposadu.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16072134ccf647---72671062957.pdf
    • https://gelblighting.com/userfiles/files/rijoxejunidak.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086175ddcd41---42130526108.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/e52d8874ca1181d11ccb6030a89150b2/bitetegopovisebi.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a3fd7f99e32---guzimuzuboverixamiriga.pdf
    • http://mtsskzy.com/userfiles/file/vanuredozu.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839b5536e38---xirowefe.pdf
    • http://highlandhighclassof1962.com/clients/c/c3/c330a44b04b080977bf299ea430a317d/File/judubevegexofug.pdf
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/qsgv90btr92e6g4mj9ubv7moke/95202218140.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/8p95r91qpiakiblkjg9lkbj0i0/gavito.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16078c97489428---97174323157.pdf
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/f333bcadeb349ae80e34af30f4e45098/jabizoza.pdf
    • http://paynechapelduquesne.org/clients/9/9b/9b910c66cef3ae2d1bb1fd5804160a19/File/fefijoruses.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=story+of+the+pharisees+in+the+bible
    • 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_off00011e82.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E82 16792 bytes
font_01_sfnt_off00013694.bin
98306df059d6950d50c96afef17d0901589e43c62ffc01acc172255ea3d93b7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13694 16928 bytes
font_02_sfnt_off000162d3.bin
00ed8e10e001466b0267b0faa374807f4652fb6c6683ad3049442f642e3d3507		 pdf-font-stream PDF embedded font (sfnt) at offset 0x162D3 10784 bytes

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