Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f90d2479e5992d8…

MALICIOUS

PDF

92.9 KB Created: 2021-07-29 18:31:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 08b5c68e60534fd2d22e7f7627cb331b SHA-1: 6ee522f3abfbf5a6b531684fb0f24a9e0ac89140 SHA-256: 4f90d2479e5992d8fd988d9088d907e65fd35745ed997cbf85246490f4150df1
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to domains associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://aiaciran.org/cache/fck_files/file/murumatej.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/442e82705d1b33edde04d08ecab4309c/nusegufotesi.pdf
    • http://goldway.jp/upload/board/file/31025210823.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/d6n6fob3upu38jrb0cbenmfap3/fukaso.pdf
    • https://vegas-shop.net/uploads/files/96672247601.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/258b884b86dc4449fdd77e1d54152c26/88331323698.pdf
    • https://akamercedes.com/images/uploads/files/gapidisexexudosa.pdf
    • https://jodhpurtravels.com/nbloom/fckuploads/file/xapugi.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/8ceb9b09628fffe3c7ab192cd6129dc6/26244023479.pdf
    • http://cbgnfinance.com/userfiles/file/jojizafesavivevikavuka.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a89a352d4---doropowewebuxemajutufid.pdf
    • http://ketoanaca.com/uploads/image/files/22929432439.pdf
    • http://jmdfhjl.com/fckeditor/userimages/file/68787737038.pdf
    • https://sitpchemcieszyn.pl/_sitpchem/file/sifazulijurowuzaneloberu.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/d17a7852b854fe229249d7fac07afc15/sowazuropan.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d93f1d1525---kikosazovakekafejubazil.pdf
    • http://labonguyenhoang.com/img-chamthi/files/11442594224.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/e721e8116710815753b8e233c47b16f9/59042198829.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160feb31ac5391---48785757093.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa62f58ce38---85261578630.pdf
    • http://sity-luxe.ru/userfiles/file/96123548103.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/4196d49cfcc06768ec8b96ae7ee394af/44021415885.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e9ffaa61e---83817130758.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=what+is+ct+angiogram+of+the+heart
    • 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_off0001088e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1088E 16792 bytes
font_01_sfnt_off000120a5.bin
884658ac365244e44bca66cf88df8b6f0388fbdb5be59642722dfa3901cf4b9b
pdf-font-stream PDF embedded font (sfnt) at offset 0x120A5 10732 bytes
font_02_sfnt_off00013933.bin
7ebe9978226fe61f00ee1cdf157813922a59f5c81c3d7f5419acb069bca0c698
pdf-font-stream PDF embedded font (sfnt) at offset 0x13933 16624 bytes