Malicious PDF — malware analysis report

Static analysis result for SHA-256 61c98f69d84ca5be…

MALICIOUS

PDF

72.3 KB Created: 2021-06-28 15:54:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 456e47b05977a5ad632693aac7f737f2 SHA-1: 4854e3def6233857f38f8d8eaec8715a25d7af18 SHA-256: 61c98f69d84ca5be646ff958fd2afafa446abcedcd8dbeab36a2e6ac7512bd4f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b578e6eccf7---46034190328.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/7a53f6ceb77fa9fc814c9d1a508f8e5e/lejemajaw.pdf
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/deb42ed452cf84eda679df85cb535b7e/36479905175.pdf
    • http://arunimaflavours.com/userfiles/file/lufofirekigibafi.pdf
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/b341993580398bfba001447b51bbe7ab/32358348109.pdf
    • http://iglozawiercie.pl/zdjecia/file/gizozebenojexodeloxameki.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088a4db49755---fisipepa.pdf
    • https://martabaktelor.com/contents//files/75843183341.pdf
    • https://mszukam.pl/dat//file/4808225414.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b3157e95410---84634373283.pdf
    • http://kayamedbursa.com/userfiles/file/73857553902.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160cbc3b6582e3---tijeduri.pdf
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/tubulevazawaxomurevafoz.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a262b07e3b1---56162491779.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba77baaf0e6---82831338509.pdf
    • https://mfdesign.hu/files/file/95572225392.pdf
    • http://adamlegal.com/userfiles/file/gagetofesox.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a3891eaaf34---kolaropuwalegokusabulaxo.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a64d676f134---libifosevukuxat.pdf
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/a566a94ff017ec0e62f27399d6aa1782/ragadawif.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d338ab5b22---73541596086.pdf
    • http://adamlegal.com/userfiles/file/finujakuzaw.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c445e16eca---zogosolopa.pdf
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607059dd8744c---86787384738.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=treat+others+as+you+like+to+be+treated
    • 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_off0000bcbb.bin
5f229e414b3d12980d42c61350883ee30fad189ad8f9132fcdc5feeee9a5fa9f
pdf-font-stream PDF embedded font (sfnt) at offset 0xBCBB 15260 bytes
font_01_sfnt_off0000e392.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE392 16792 bytes
font_02_sfnt_off0000fba9.bin
6383e186d3d2720e3fecb2d706d24f6ea945bc2b50009948c670939fed79c84b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA9 10648 bytes