Malicious PDF — malware analysis report

Static analysis result for SHA-256 fab9debc46ceb40e…

MALICIOUS

PDF

91.0 KB Created: 2021-09-13 02:35:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 316421c345ddf1b781835cfcbbf18d4a SHA-1: c59ea1d577feab1e38013e89835db60af07831f7 SHA-256: fab9debc46ceb40e173972bc813c3653c87e6b81d90c435a1e5979a8ff8b9178
204 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or trojan delivery mechanism. It contains a fake CAPTCHA lure, designed to deceive users into executing further malicious actions. The document also includes numerous URLs, some pointing to compromised CMS uploads and link farms, suggesting an attempt to distribute or host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://apgr.eu/UserFiles/file/luzanenabupejetezesasukev.pdf In PDF document text
    • http://varadimasszazs.hu/uploads/files/73667289228.pdfIn PDF document text
    • http://saint-party.com/media/file/46332162557.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210905193113_bl7db7.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/95951112514.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8dc68b0fe---sunavorob.pdfIn PDF document text
    • https://biharlokmanch.org/userfiles/file/95141854202.pdfIn PDF document text
    • http://thomas-zigon.de/images/file/delozufo.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/tizadami.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/48165792005.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/vevujelonimedus.pdfIn PDF document text
    • http://leylasuren.com/images/userfiles/imagefile/dukanuvunesitowabigipe.pdfIn PDF document text
    • http://vaynhe.com/upload/files/29498424180.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/ruvufunotogejaxewipip.pdfIn PDF document text
    • https://mimpishio2bet.com/contents/files/xupojatusukevob.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/38933368987.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/11054358545.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a1ad25e35---rivijeturezanazerefi.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/budixe.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd03e17ed6---55624351140.pdfIn PDF document text
    • http://drumlockingclamp.com/FCK_Editor_Images/files/barirumajirami.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/xagimolokazijimutapaki.pdfIn PDF document text
    • http://phnews.ro/files/file/22641026320.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=mobilegta5+mobi+without+verificationPDF link annotation
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF239 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A50 11132 bytes
SHA-256: 4f39c1e2753ef48038416743cf4c8228fea983f5b00fb8cce784a814d660e8a1
font_02_sfnt_off00012439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12439 22192 bytes
SHA-256: bb5afb1ba168dbc197aed12a8195f6a8f0d4cd8385ea9d3d3a61bc846cb4892c

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