Malicious PDF — malware analysis report

Static analysis result for SHA-256 24fbfaadd3600118…

MALICIOUS

PDF

69.3 KB Created: 2021-10-04 10:54:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8292b76e4f5498e66667f46ea0c7a801 SHA-1: 834a7fa0e13507d8b60adb0745121dd529a22fb2 SHA-256: 24fbfaadd360011833beebb186a80f2c05794174986f710102b90bdbe12c2600
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crewmak.ru/uplcv?utm_term=the+meaning+of+the+word+demeanour+is PDF link annotation
    • https://bluza-shop.ru/content/File/gitifanadotenafotozinila.pdfIn PDF document text
    • https://sleepthai.com/piceditor/file/44018595785.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/lajoviwavafotiwa.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/nobil.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/56258612594.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/juxoxa.pdfIn PDF document text
    • https://laps.pl/userfiles/file/81318363464.pdfIn PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/62265571297.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/9174822411.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/kobesovovejujonuvoseso.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/rovopipoki.pdfIn PDF document text
    • https://booburger.myagenda.cz/pictures/editor/files/fivewolov.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/91014470331.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/73584336449.pdfIn PDF document text
    • https://kaptenhoki.com/contents/files/manekepininezitaxa.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/lugolav.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/56244193826.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161323791be0d3---lesiwusenefax.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/34f799f1e7e238114e78de5a89552e61/59472754.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/tonuzoxa.pdfIn PDF document text
    • http://kowalstwwo.pl/public/cms/images/file/kagulak.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613992dc5d7fa---6266120435.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/gowarodawudobomizu.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_off0000ae1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE1C 16136 bytes
SHA-256: a7c113389862b281f8881c79a55d3b8062786a3aa072c57b8b3a517d265ba1bb
font_01_sfnt_off0000d6dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DD 10904 bytes
SHA-256: 78c9f98fc4bc6169a7196c1841c385c0830e0e61d5434328d766d0c884d8d79d
font_02_sfnt_off0000efc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1