Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf272e66ceb02b67…

MALICIOUS

PDF

83.5 KB Created: 2021-09-09 14:33:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 47771c3b2d21c5b9fec245e51a26f6b4 SHA-1: 692f6fab944a19d8b82a92b0a6c263bb1d6078d2 SHA-256: bf272e66ceb02b67c46bd1e81e78d8aa02eef8158004024e048b46964038b96f
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to lure victims to external sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 https://wastran.ru/uplcv?utm_term=enter+recovery+mode+android+using+pc PDF link annotation
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/76747cb1a12029fe3d78c8909a5b5c7c/rinaxiw.pdfIn PDF document text
    • http://auto-rad.pl/userfiles/file/46226571908.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d888b43d4---wiwikanawebodidazilemij.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/luwodedun.pdfIn PDF document text
    • https://varida-tech.com/ckfinder/userfiles/files/41326939838.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/tejonurelagoxikuwunetike.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/xakoj.pdfIn PDF document text
    • http://twilaw.com/files/files/57670425753.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210906183701.pdfIn PDF document text
    • http://vdavloeren.be/userfiles/files/80703219730.pdfIn PDF document text
    • http://stefani.cz/fck/file/44104879116.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210902165802.pdfIn PDF document text
    • http://astmasme.com/userData/board/file/nabisinuwofonusosijozag.pdfIn PDF document text
    • http://luligang.com/ckfinder/userfiles/files/71374985842.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/30192626025.pdfIn PDF document text
    • http://ltpbetel.ro/userfiles/file/21690223629.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/12475857810.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/76541165324.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/951uobjheirh24e3ujb386tgi0/ralajiwon.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/80922328498.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/piwejogozewuju.pdfIn PDF document text
    • http://ubytovna-krumlov.cz/userfiles/file/89750245006.pdfIn PDF document text
    • http://schokozentrale.de/idata/sotaperikixomu.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/5721746346.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f644d3055a---lalujobav.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/82074460660.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/savugivitazigusam.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_off0000e0f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F1 17416 bytes
SHA-256: 32a0f4d5c94d1ae6436409665f1aaf505fb661fc2762b8a04736d8f9c7102cb2
font_01_sfnt_off00010dde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDE 11072 bytes
SHA-256: d890dc6bbbc58f42e26d13ad44955bc1865cd309ab061bf7d69aa264c1ea1de9
font_02_sfnt_off00012787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12787 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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