Malicious PDF — malware analysis report

Static analysis result for SHA-256 71eaeeb2b77ff76b…

MALICIOUS

PDF

90.2 KB Created: 2021-09-17 02:33:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 0038c55f2796b984c75c6b70bf0f3099 SHA-1: 05c4d53e23ed8c592d9a4809667b907065e07cf6 SHA-256: 71eaeeb2b77ff76bf1e78feb0e59100d77873e2be5923e29fba5928f78b9a35d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://philabc.ru/uplcv?utm_term=can+you+retrieve+deleted+videos+on+android PDF link annotation
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8a5e7b359---10020586290.pdfIn PDF document text
    • https://isosklo.cz/uploads/94942010061.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/26624277937.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/tiberu.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/jabefile.pdfIn PDF document text
    • http://joyerialaplaza.com/ckfinder/userfiles/files/gajirogafowixi.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210915193029.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/56177124886.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/1d504a923f38c0198bea9cfd104b4959/lawulazaf.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/68515236212.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139861e4f4ba---41941702102.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/79558743913.pdfIn PDF document text
    • http://sun-tes.ru/files/file/bofezar.pdfIn PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/51328304346.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/43666301221.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614155e3907ed---mexeweluwosobajuxu.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/280662240.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/fogokigirexorekexamafoge.pdfIn PDF document text
    • https://kham.vn/userfiles/file/zikazu.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/geretevi.pdfIn PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/67708317551.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/161387103ec8c3---vibukowudidagusekutuvoz.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/zenefabaxokitokowobi.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/43740075734.pdfIn PDF document text
    • 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_off0000fd6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6E 10552 bytes
SHA-256: 624a882988faa3378cae8646e4c4f94883a87865f9f0d9a1c5820f149fb7e5ba
font_01_sfnt_off000115a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A9 17676 bytes
SHA-256: 90a8cea8f70fe694e6a593a9264d375c98d36f58d7dcf6a7733524b05ad7e592
font_02_sfnt_off0001431b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1431B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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