Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9470b83da3ca77c…

MALICIOUS

PDF

72.7 KB Created: 2021-10-04 20:26:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a234d348d9cea1f9cb25b72cf75a1ec0 SHA-1: 1c2f6a14d49a991366b6f678e634aae14e093b7c SHA-256: e9470b83da3ca77c8577a7c312b63eb556f133f670c6e53de71fdbb41d87a9f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It functions as a link farm, containing numerous URLs pointing to various domains, some of which appear to be compromised WordPress installations or disposable hosting. The primary purpose seems to be directing users to external sites, likely for phishing or to download further malicious content.

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://laborke.ru/uplcv?utm_term=rowing+merit+badge+answers
    • http://pobierzplik.pl/uploads/files/72000371785.pdf
    • http://purofirstli.com/userfiles/files/18386024903.pdf
    • https://atavio.ru/files/file/bazozetatotariruzub.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/f146b11c0209674c6808feff8d54a69b/gizoledutasin.pdf
    • http://huseyindurmuslar.com/images_upload/files/4333629867.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1615209ca14e7b---98521842614.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7aa6e7bff---67474588651.pdf
    • http://zrdb-drogbud.pl/Upload/file/zaganowukupomap.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a086e55cf8---26556500114.pdf
    • https://www.mds-horizons.com/upload/files/97779628126.pdf
    • http://progettogeometra.it/userfiles/files/34436453568.pdf
    • http://namlinhchisapa.com/userfiles/image/file/vifur.pdf
    • http://www.bsa.by/ckfinder/userfiles/files/diret.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc194d605a---visinoxipirunes.pdf
    • http://dentalclinicbangalore.com/uploads/fivufadegasog.pdf
    • http://topoint.net/userfiles/fckFile/20210919081730.pdf
    • https://dalton-english.com/userfiles/file/68164798734.pdf
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17614940637.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_off0000bb5a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB5A 16792 bytes
font_01_sfnt_off0000d36c.bin
631a3a9943e6cbea622b0fee3c73b2e737533535fc6942629167cdbce96c1320		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD36C 16128 bytes
font_02_sfnt_off0000fcb9.bin
377d3ef92b228666b09f26cf4f88de0fe27cea3eb6df854ab262baac12104bfa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB9 10816 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.