Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a5968e079b56818…

MALICIOUS

PDF

85.5 KB Created: 2021-08-01 16:22:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8d7da0e9b9f82434589d219f8fd4bc18 SHA-1: 821deca1d0703980ff54647eb2f3a65057cb4d09 SHA-256: 7a5968e079b56818fa90e7d5d9829aedc0f451efd8d6fdc12d31ec6519f39e9e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to distribute malicious content or conduct phishing. The presence of external URIs and link farm characteristics strongly indicates a malicious intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://muzeumostrowiec.pl/obrazy/file/13640607977.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c731e6a49e---bisanizebusuxov.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/92720dc4850c774bf4a1a3070e82132a/reluzujurorovevowalusiwiv.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160cab8c2300c5---lovomuriwemiz.pdf
    • http://beming.com/ressource/site-image/files/xidevemuwefisokunudalamur.pdf
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/5006fcd8f9a6dc632e73f2bf8c2471c5/kawunobafenumokediveb.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a43067bb424---nupovefotuwuxuxodilatidox.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/9686da71f85b0e505dbc3eb538475400/sifabubexovasew.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a27e2e2aa90---83884086990.pdf
    • http://conelser.hu/fck_uploads/file/bikolokekiteviwamo.pdf
    • https://tlproduct.com/userfiles/file/wemepubozijifu.pdf
    • https://sca-kc.net/scauserfiles/files/29382960041.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/79bdd2f6cdeef3a4f9c68402e6b924e1/81270966751.pdf
    • http://bephoangdung.vn/uploads/ckfinder/files/mupoteleniz.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/pg1k4r9dsrl9ugkpotvtg402de/85502481938.pdf
    • http://fmi.lu/userfiles/files/65901581857.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8093512e2---33061658956.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160878cabaff7f---16290014041.pdf
    • http://devison-matras.com/upload/file/gutamexativ.pdf
    • https://sofupingame.com/calisma2/files/uploads/kikegiwawomoxowe.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072111abf5b8---39846107566.pdf
    • https://bodymason.com/user_uploads/files/jevozukudidubawibozak.pdf
    • http://portaldo.eu/contenuti/upload/file/14023335635.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d1c8ac22e---tununiwozewagev.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073c2e515c66---xefatamiputebonazepok.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=cu%C3%A1nto+equivale+un+sexto+en+decimal
    • 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_off0000eb5f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5F 16792 bytes
font_01_sfnt_off00010376.bin
ce2ea2ade27d063685e79cfd754e29664d70b43f3863eec9192a4f22708a9d2c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10376 11056 bytes
font_02_sfnt_off00011caf.bin
7dc6f451988898123fbdb78bdc682563aa4c0558e29765cacf4f399e51a8e708
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAF 16160 bytes