Malicious PDF — malware analysis report

Static analysis result for SHA-256 65c7e4cc1d8d56fa…

MALICIOUS

PDF

91.1 KB Created: 2021-07-06 23:22:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1b2aa2a774ce5e82bfe3e3ac6f28f023 SHA-1: 72f448d8ff0898494c897fa29cb48f9e726f8072 SHA-256: 65c7e4cc1d8d56faa30f6357c53c48f6e42420b1d1017987b03bb0ee6fc17666
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it's designed to redirect users to malicious content. The presence of a link farm with UTM parameters further indicates an attempt to lure users under false pretenses.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 https://crewmak.ru/uplcv?utm_term=hunger+games+free+book+online
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608827de30661---zimajapiwisawowasunurez.pdf
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/6824d34cf6f3a3ec460dabb956aff11f/65712195013.pdf
    • http://tortsurprise.ru/upload/redactor/files/jowaj.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1609bf47a87374---mixarejafo.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608853bd901a6---worakofofo.pdf
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/79178842370.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/45c739dc8b419ed3d2b16ded2b860044/89358484381.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160963e6501606---zumelavupo.pdf
    • http://chi-kara.net/userfiles/file/65207094096.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/9651670db006e009a5b10c4584a84807/bunotujede.pdf
    • https://bitree.ru/ckfinder/userfiles/files/fixoranaza.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/115f5cfaa28e0988ffc282a2837fe41f/6421804306.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdcb2c88f29---gumijunodusinonuxom.pdf
    • http://www.srijonihealinghome.com/fckimages/file/nujogoxawefewupumep.pdf
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/2239097603.pdf
    • http://93564497.com/userfiles/xulow.pdf
    • http://asesorgubernamental.com/images/file/moxotise.pdf
    • http://heritagecarletonplace.com/clients/c/c2/c23aa4fb54f25340752d20cfcff880b2/File/kesubifoxusikilad.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8337cb914---97784015079.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/518be800147f0bdacb43f28eef821204/70264485269.pdf
    • https://silverlabpupsforsale.com/userfiles/files/lakusolepu.pdf
    • http://alpanelektrik.com/depo/sayfaresim/file/29643725652.pdf
    • http://asja-doll.ru/userfiles/file/rufekamozonazif.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0538bbe3fa---43652196439.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/9ovb757nc8u5392qqju96ie7o6/sakavotumifisomivazijifob.pdf
    • 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_off0001008c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1008C 16792 bytes
font_01_sfnt_off000118a3.bin
21fbab60aa511cf2871481862aeb3039577de3a4df7974fa7321fafbf162c43a
pdf-font-stream PDF embedded font (sfnt) at offset 0x118A3 10780 bytes
font_02_sfnt_off00013158.bin
91357db0079da0742e4f01dea81622a6603b78829b0b9bc2131ab5ecc391bb40
pdf-font-stream PDF embedded font (sfnt) at offset 0x13158 17312 bytes