Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1abf27795c69987…

MALICIOUS

PDF

68.8 KB Created: 2021-09-19 03:05:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4dd3ead1ab04d9a6b2525c222b7a8bd7 SHA-1: e470accd4c3395de4146bfc1c66143b06a1844cd SHA-256: f1abf27795c69987e48e2ce2b214559f9b8ac25d08bc9299193fd99408a8c673
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, forming a link farm. Heuristics indicate this is a link farm designed to redirect users, with ML classifiers and ClamAV flagging it as malicious. The primary attack pattern observed is the use of malicious links to lure victims, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://archism.ru/uplcv?utm_term=crash+bandicoot+warped+iso+download
    • http://www.farmaciapenil.es/userfiles/files/59903173072.pdf
    • http://88cpap.com/userfiles/files/22998774108.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614060ad5d70d---voxomoziguxisej.pdf
    • http://studiopignotti.it/userfiles/files/50453563609.pdf
    • http://realtor-madrid.com/uploades/fckeditorfile/ridexatuvofoxizizafane.pdf
    • http://titusauto.hu/kepek/file/51572643534.pdf
    • https://podiummagazinenews.com/ckfinder/userfiles/files/ronapewe.pdf
    • http://kanomax-nsk.ru/images/rofit.pdf
    • http://unibeauty.com.br/ckfinder/userfiles/files/zubezojokijiwome.pdf
    • http://3bbb.fr/ckeditor/upload/files/wisasisevonotafowokadi.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411224b01c2---ximasexumisirixoba.pdf
    • http://futsalcb.cz/picture/vtextu/file/84377886355.pdf
    • http://progettarecasa.com/userfiles/files/98067794795.pdf
    • http://msnladyboy.com/ckfinder/userfiles/files/23798009858.pdf
    • http://phongkhamthienhoa.org/images/files/vuludawim.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ccf49b8468---kebotowumubebitaz.pdf
    • https://milsagliksen.org/upload/ckfinder/files/devezuv.pdf
    • http://isisthailand.org/file_media/file_image/file/92983707857.pdf
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/bovadixoxamut.pdf
    • http://9y.bfage.com/upload/files/20210910171621.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_off0000acac.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xACAC 16792 bytes
font_01_sfnt_off0000c4be.bin
87d8ed24d0b5a2268dcbd9a017aeba2e0d28a37465384902daefd8c77fa44c60		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC4BE 15752 bytes
font_02_sfnt_off0000ed19.bin
f8e89f05ddb47f1b54afa12274e7c88ddcf56751435b72be5e96f81495a62029		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED19 10868 bytes

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