Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb8b1768e592a6e8…

MALICIOUS

PDF

94.9 KB Created: 2021-07-15 22:55:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6534b27c4946f1b7bd53bbdc98eb9eb5 SHA-1: c7ab6862a499b636376eeb5c1a7e64a3e75eadc3 SHA-256: fb8b1768e592a6e8ac23f63f36900d60b2f9def0dab2acbf6d5e28da8362efb5
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a ClamAV signature and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, aiming to trick users into visiting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://pistant.ru/uplcv?utm_term=five+nights+at+freddy%27s+4+demo+free+play
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/dec2b2f333c31a3e04ed81df730fedb4/96836963409.pdf
    • https://clickkedai.com/userfiles/file/lilusojixefarifafinalex.pdf
    • http://bagiez.com/userfiles/file/64345818991.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b75eccd8a0---sikitologobefivawadefaxu.pdf
    • http://haki.vn/uploads/files/gufalatakafupakipefom.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a9645eda428208f5a22c9e29cc0459f8/towotepanoxuwafurafatu.pdf
    • http://savitapiti.org/ckfinder/userfiles/files/figokakura.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/d28b4f6047e0fe1e804d0101855ab77d/78656503786.pdf
    • http://say-international.eu/userfiles/file/wuluguwuzukumedun.pdf
    • https://shiokerbau1.com/contents//files/lumewifovipenurani.pdf
    • http://aarogyamedico.com/userfiles/file/fefujuzizupemikuge.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160afd90460c0c---61875805900.pdf
    • http://madmojo.com/fckupload/file/16366866838.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec1bdb6b41---69249626671.pdf
    • http://babywagen24.de/userfiles/file/gerazetopamerapa.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609479f42d0a0---79910669914.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d15dd76b52---duwowiguxanimikipofogus.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/da0432f2a51ca8bf7a1241f5173924b4/99914765577.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160707dfc822a7---balipok.pdf
    • http://royalproductsonline.com/userfiles/file/jusuvitodaropomuzogulawa.pdf
    • http://vote4dannybarry.com/clients/2/2f/2f5d4f67c16906f9b09010289963de11/File/655738653.pdf
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/27ee2d53c153e7cf50e7893f2e43ce65/43359053673.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ce9de9346---12418046893.pdf
    • http://axiomestates.com/userfiles/file/31436329302.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f72b.bin
c3f09e569a816df32067a89126487d5067ccda7ee92ed4fd602ddd3662b71dfc
pdf-font-stream PDF embedded font (sfnt) at offset 0xF72B 17372 bytes
font_01_sfnt_off000124a9.bin
7ebe5da6536ba80c71c356f6a9d9bd28fe7fc3bb5f74e61c009922d77fba7309
pdf-font-stream PDF embedded font (sfnt) at offset 0x124A9 11216 bytes
font_02_sfnt_off00013e9a.bin
67cd4328d5fd6e9134f1b1c85b1680a1a932e20a6f130eb7c914dfd2913d640b
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E9A 16640 bytes
font_03_sfnt_off00015554.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15554 16792 bytes