Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff0eb644444647dd…

MALICIOUS

PDF

76.6 KB Created: 2021-07-06 08:15:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 56a3134c136e427481ce09ab3a7cfc25 SHA-1: 1e6ea9ffd95f3b61834a52d61730f74e611260c4 SHA-256: ff0eb644444647dd8d0b96064704435d11499cc8da127f664c4d5967c0c06ac1
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 WordPress sites. Heuristics indicate this is a link farm designed to direct users to external content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/b90be2a4b7803f732fc61f41b4f6fa5d/simevawusapepifodobapor.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/basu4c0j4tfrm6qe0cvgljnf2g/gojajodopuxapareloto.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3db9a7ff0---82825194299.pdf
    • http://etenindex.nl/images/uploads/depixipafilus.pdf
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/43577602966.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e47357ac90---navefowusowot.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/kmobaa5nr3ho35p4qapc61vvm3/xibuwejakoluvusefegid.pdf
    • http://rittenhousereunion.com/clients/a/ad/ad7d26974070b67854a29702aed78614/File/pilekutinitopefidu.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/fd7e83d2bf5e97810b66a2c6f9ff327f/88675190527.pdf
    • https://asiabiru.com/contents//files/46789602552.pdf
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/5f924c924bd285c8b201e1fc3c9e59ab/63032873515.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/mhud3ci61pdtskude4ea60gci5/89977428725.pdf
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/30668203127.pdf
    • https://renault-service.com/userfiles/minomaxarufapakogo.pdf
    • http://computergramm.com/userfiles/file/92873212158.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/blvl0u9b58pp823dpkqdk1cnsr/36164181739.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/6d80d33f789789f37e1e72b563e6ea7c/loniza.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c62a7e860f9---59141097520.pdf
    • https://langumeistras.lt/i/File/76719906265.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9399ddbf9---pajemujakosivosu.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160904b0f0dafb---xinikenunogaxugo.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/6719ecf2d29bf5c98b9e05e68f952efc/82278157496.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160903e137587e---55480915158.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609708ead21ae---45806365568.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=amateur+mature+housewife
    • 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_off0000cb1b.bin
82edf7f1671f0a95cbb3f1d50b03b313b90f75ceb9335a8ff683b100b32877b3
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1B 16508 bytes
font_01_sfnt_off0000f566.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF566 16792 bytes
font_02_sfnt_off00010d7d.bin
75bf51257876cd6536c732b7fd2d3b19fee441cc6c19eb2f4486fd86af21e07f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7D 10496 bytes