Malicious PDF — malware analysis report

Static analysis result for SHA-256 24f1a860edee7999…

MALICIOUS

PDF

71.0 KB Created: 2021-09-17 08:29:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c2f462e5ea00e82bd3472330747f5868 SHA-1: a9c1b17cbfb7bca0df8a26f7d0c0281c0b88ed88 SHA-256: 24f1a860edee7999b21c7676b1a7c76f9d92e115ec1d4e1549040b89cbc008cb
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malicious link distribution intent. The document contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm. The primary goal appears to be directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://synerhu.ru/uplcv?utm_term=how+is+prokaryotic+cell+different+from+eukaryotic
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/27d810971254b0ea285e3bc278ba1ee1/lagewo.pdf
    • http://peetersinstallatietechniek.nl/upload/files/gedetumatis.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139fd4411fc1---15557586533.pdf
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/jukulamenimakasoraja.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/99cc1f9356699140bf2d8e90fcccd01d/viroxelij.pdf
    • https://equimat-cheval.fr/file/96367009714.pdf
    • http://mlsy.cz/images/file/files/digotilujuru.pdf
    • https://organicfertilizerproduction.com/d/files/36263811224.pdf
    • http://zbraneklapka.cz/ckfinder/userfiles/files/kawakeradufonugofi.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613324e1ed8d0---22739193749.pdf
    • http://stopguepes72.fr/userfiles/file/34107019736.pdf
    • https://damiel.eu/userfiles/file/2202376942.pdf
    • http://www.pics4us.de/userfiles/file/18208806041.pdf
    • http://squash-fitness.cz/userfiles/file/39158547199.pdf
    • http://bajkolandia-leszno.pl/userfiles/file/rezelararaset.pdf
    • http://www.lnk-creation.fr/upload/file/91762276263.pdf
    • http://sccsfz.org/upload/2021-09/26010294278.pdf
    • http://kursadowicz.pl/Upload/file/73505175962.pdf
    • http://barsugo.com/ckfinder/userfiles/files/makaresiwosewumenujisu.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec0aa47561---lemitu.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16133df512fd2e---gugomimivelul.pdf
    • http://elfast.ru/userfiles/file/29657573906.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b68d.bin
1efd9e4eba3627d902423dc7724ff9ac70c6a9386ee63140fd47464cb45f6109		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB68D 11164 bytes
font_01_sfnt_off0000d0bd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BD 16792 bytes
font_02_sfnt_off0000e8cf.bin
43461568f51d6149974fbf5ed511aed4724211e7778248c4972baecddad53898		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CF 15004 bytes

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