Malicious PDF — malware analysis report

Static analysis result for SHA-256 49cded153be743a9…

MALICIOUS

PDF

76.6 KB Created: 2021-09-18 01:56:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d27302b51dcfbaacdadad1ed8fe42b31 SHA-1: 2ea81200913718a8495923adcae720bdabf76dc4 SHA-256: 49cded153be743a93b7e07f30a9d29969e0f696aa05ab006146fe28000e57f3b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://queure.ru/uplcv?utm_term=best+news+widgets+for+android PDF link annotation
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140354329d2f---tajosipirobesuvopisotefo.pdfIn PDF document text
    • http://mfahk.com/upload/files/94220667039.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/93443115582.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/mazupamujogexitodilika.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/lagonefuzigonakexon.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/60079698457.pdfIn PDF document text
    • https://sona3elkhair.com/userfiles/file/vokorixizirira.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/64061960406.pdfIn PDF document text
    • http://akvatoria.by/UserFiles/files/14096776919.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/58210084902.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/22227712964.pdfIn PDF document text
    • http://gardena.crazyrockinsushi.com/uploads/files/fulepo.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/19490564558.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/viwabaj.pdfIn PDF document text
    • http://woodlander.sk/grafika/file/bolobekibaxujexotimefikeg.pdfIn PDF document text
    • http://quesnelfoundation.ca/userfiles/file/48846555129.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/wumodunawafatanu.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16131cfc117716---16318008228.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/43415607971.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/24750905565.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/wetelugozalitevafodunadav.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/56020716586.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-18/20210918060829775364.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_off0000c88b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC88B 10620 bytes
SHA-256: 7ef4780266d56f8e0beedcd40a7b14dc177b1fe7778c1cd58ce6508e776a8cfc
font_01_sfnt_off0000e0db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DB 16996 bytes
SHA-256: b08debf661a121dd5a8f6d01364717f682c35d80eaa0ed1cf159d893cf72ce64
font_02_sfnt_off00010cd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1