Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7a678e65a1c82b6…

MALICIOUS

PDF

84.8 KB Created: 2021-09-20 15:08:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bba1458bb45d64f61333e000522ff6b1 SHA-1: c8dfe22c6e1df1eacf6c290e4a8dc851db81fef3 SHA-256: e7a678e65a1c82b6a2284058729ad0e470b6b28f947d1a2417195856ef605915
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://garglob.ru/uplcv?utm_term=numeric+keyboard+android
    • https://reclamesticker.nl/images/uploads/file/
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kidewagumu.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613757bc25ac2---14098226806.pdf
    • https://stancijanegrin.com/UserFiles/files/94352217393.pdf
    • https://ayurmitra.com/files/file/6249969527.pdf
    • http://szpital-sulecin.pl/images/fckfiles/file/sovarug.pdf
    • http://casaledellasignora.it/userfiles/files/xikewifovojewaselutegerup.pdf
    • http://preiswerte-unterkunft-papenburg.de/mediapool/fivoza.pdf
    • http://modernplating.com/userfiles/file/lopolobidem.pdf
    • https://tranduongauto.com/app/webroot/files/images/pages/files/70715283765.pdf
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/15303053251.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d56c77247e---83784754812.pdf
    • http://gaineyranchaz.com/userimages/zisijotozudupapaso.pdf
    • http://herfon-machinery.com/images/ckfinder/files/20210910200458.pdf
    • http://hoangle.vn/uploads/userfiles/file/76058808645.pdf
    • http://sjatupornservices.com/file_media/file_image/file/botigesowixutitojaga.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/g5rs3uavv0d748q60pvuqea145/sajemisusuzazuwomazal.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b33e9c96ae---xupotinotis.pdf
    • http://vallovin.it/userfiles/files/99863672262.pdf
    • http://sushistoryus.com/uploads/files/zosedafokodagu.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613af6e15c4a4---83764549805.pdf
    • https://dmshospital.com/mm_engg/files/56822386377.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf0960038b---9923932778.pdf
    • http://twfbs.com/ckfinder/userfiles/files/xirofu.pdf
    • https://clubon.top/uploads/files/foxosefosenexabogixitijow.pdf
    • http://emailreceptionist.net/userfiles/file/gunojoso.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_off0000e667.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE667 16792 bytes
font_01_sfnt_off0000fe79.bin
2170d4c63949f47305d629fdec5b91dec129a6203e9e5275d14b28780ad5eeca
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE79 17904 bytes
font_02_sfnt_off00012d03.bin
cd380620b13ea7fb3fde8e24db4a104f29d478c56afc19f74a7d335df8dc9f23
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D03 10644 bytes