Malicious PDF — malware analysis report

Static analysis result for SHA-256 ead7d2c0a35200f6…

MALICIOUS

PDF

85.6 KB Created: 2021-06-29 13:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1fa0c3f375aeedd49f9e549643a6fefa SHA-1: 7220a343ead8e0e3119f658f10ea233ade01a209 SHA-256: ead7d2c0a35200f6eb43d948ff62c1982217aaef08a2d451143182dce6fde899
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised websites, indicating it functions as a link farm. These links likely lead to phishing pages or further malware downloads. The ClamAV detection and ML classifier strongly suggest malicious intent, consistent with a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://mannerfeltdesignteam.se/ckfinder/userfiles/files/92668575099.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a926645bdf4---tugeravipo.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4fcf4325a---68402308949.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160c9750bce749---lasobetupimitejefizin.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160875b8f083d6---fazuwonejitinam.pdf
    • http://kythuatviet.vn/uploads/userfiles/file/43411220814.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/ta88j0cioh5qtph56t1hv2hskm/lazopazo.pdf
    • http://southwest66reunion.com/clients/f/f6/f6f8b7bd17d60304c359e527a2c43449/File/54516293107.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b604e917a9f---50019764436.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9877f5b207---gefazosexowifivo.pdf
    • http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/8356711826.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d8f68549b---57754124451.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16088baec4bfd4---29806277956.pdf
    • http://vienkiemis.lt/app/webroot/uploads/userfiles/files/61398527995.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/icksk7g6q472uv7hbh18ohfgev/zedaromanofonugekavufoz.pdf
    • http://www.annaleehuber.com/content_files/file/fotemuzuguzagalimev.pdf
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160988b8bb2f69---radazepolijosubitoru.pdf
    • http://intergeored.com/upload/File/junidibipadune.pdf
    • http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/63085856323.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a484bc212d8---22677669735.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943cf1b053b---20547170291.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/v6etosppo349cgivm1odmp1if6/jukowob.pdf
    • http://hongdanhaudio.com/luutru/files/fugitizarovumeweviwato.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=used+trans+am+for+sale
    • 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_off0000ed21.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED21 16792 bytes
font_01_sfnt_off00010538.bin
8cfdd3a1115cd34a7ccd6502885c1c8e2303c1a4045262df0cf669a1ab29e03e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10538 10432 bytes
font_02_sfnt_off00011cdc.bin
68c8644c5e0f9aad6ea4571b877a9147e5ce150c9f4dc89a3e21a23fd879e827
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDC 17064 bytes