Malicious PDF — malware analysis report

Static analysis result for SHA-256 82ec9f63cf4f0e1e…

MALICIOUS

PDF

83.8 KB Created: 2021-09-02 23:59:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8f3908ba4c5e525b34ec15fad41e6cb8 SHA-1: 774da1914e9fc76c87de77fe5caeacf12010e8c5 SHA-256: 82ec9f63cf4f0e1e88928bd4dbfd233eaf25055cb2aaec9ff629351f09bbe8e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to exploit users by directing them to potentially malicious external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://hrzservices.com/uploadfiles/file/79043477390.pdf In PDF document text
    • http://minutemen-jrotc.com/clients/84940/File/mutonidakagebiwisokederus.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/13582405969.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/xuboxusagorosadobibogo.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/duxavelowiz.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/wokeveguki.pdfIn PDF document text
    • http://d4scanada.com/clients/8/81/81a8d3ecf29e0a7d9042e8364394d873/File/batego.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/xedusesulejukitufavomut.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/wexizuz.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/4fnrkau4vjfrv4e8158i04d4a0/xozejor.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/47862327809.pdfIn PDF document text
    • http://khocabien.com/uploads/files/28097733559.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210813_6205B81F90C52E61.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/11970437717.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110487b796da---nizek.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/zonawifeluzunetuzerave.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745f35ba63d---44879039518.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/74650253047.pdfIn PDF document text
    • http://supragyn.cz/userfiles/file/52905090355.pdfIn PDF document text
    • https://khanikango.in/file/4191132308.pdfIn PDF document text
    • http://sam-global.ch/files/file/49148307529.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608536afe08a3---rojanavaditisabimefopapi.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611255dac81bb---lelinobiwogilegubobog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=make+pdf+look+scanned+onlinePDF 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_off0000e54f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54F 10500 bytes
SHA-256: e45c6995c10c233f6dd7fe668fab1a7c040e6c342bc9fd7b3bf017336d15d781
font_01_sfnt_off0000fd4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4A 16856 bytes
SHA-256: 5ccf417458237420cbeadffe39c13808783da123e8dd632b179bc25e2092b9fc
font_02_sfnt_off0001296c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1296C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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