Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7682dae7fed266e…

MALICIOUS

PDF

79.4 KB Created: 2021-09-20 17:17:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 63933b272d1b7223db4a3005bd3a352d SHA-1: 48d45f0604010a899cb7c04d783380020bf773db SHA-256: b7682dae7fed266e8aba7885ef02fa145cd71d309362e91349fc95c27841d5e0
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of multiple external URIs and link farm characteristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/58827997799.pdf In PDF document text
    • http://cdenito.net/userfiles/file/fuxaravo.pdfIn PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/54432274847.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/rafimewuwojinifapap.pdfIn PDF document text
    • https://mklaassen.nl/images/file/98646900518.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/161489361a4043---68276493742.pdfIn PDF document text
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/piralixomakot.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/b838927271d0706e6ca040c560136c8c/kunasogusotezetuba.pdfIn PDF document text
    • https://searchlink.org/userfiles/file/japas.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/e8b2f9852b6b50c53d8437c530a1084c/wumub.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/dalerikexemufikigow.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/88581904098.pdfIn PDF document text
    • https://eccdc.org/application/webroot/userfiles/file/2829584802.pdfIn PDF document text
    • http://severstroysnab.ru/userfiles/file/gerazukozibotabo.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/13190066902.pdfIn PDF document text
    • https://el-tall.pl/pics/file/91898734910.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/47753889610.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/22369047081.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/manebavilevutugulas.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/57419684110.pdfIn PDF document text
    • https://netiko.fr/img/Data/file/gelitovibofuw.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/xerediji.pdfIn PDF document text
    • http://phutungtdc.com/upload/files/46755511193.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/dodivojusupa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=adult+live+tv+apkPDF 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_off0000d129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD129 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e93b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93B 18500 bytes
SHA-256: 55bb4d181e10967ac6a7f3ccdf4918a006b1ab4b6b29633abe2b504f393e827f
font_02_sfnt_off00011916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11916 10132 bytes
SHA-256: facaed95c156e675e5205a7339b1896acc166226180ab9dd475739a72696f649