Malicious PDF — malware analysis report

Static analysis result for SHA-256 a593ed235190f04e…

MALICIOUS

PDF

86.4 KB Created: 2021-09-18 14:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7efa3bb8fb36229b0a1ec6fe668780b9 SHA-1: f4676b7197870e2579f663f45bec9fa506248a61 SHA-256: a593ed235190f04e0fd7cc7066230160605b0c72f2f872bb319eeaab5398995a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://philabc.ru/uplcv?utm_term=hd+screen+mirroring+apk
    • http://carsonpokebar.com/uploads/files/17056857710.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bdd92d2019---14214582.pdf
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/29447843259.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcc584c608---87125363315.pdf
    • https://segurodegranizo.ar/noticias/fckeditor/file/96508669458.pdf
    • http://moneymaker-gold.de/files/xakurafe.pdf
    • http://sm300159.agchost.com/userfiles/files/49022388847.pdf
    • https://alwillislifecenter.org/ckfinder/userfiles/files/18241497110.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aed586f890---miweg.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/i2n47r33gdr99t0fd89m4e9oi5/3514269633.pdf
    • http://www.psoealora.es/ckfinder/userfiles/files/39829723367.pdf
    • http://www.tramag.pl/upload/file/635251569.pdf
    • https://masterjobintl.com/ckfinder/userfiles/files/77776997798.pdf
    • http://rurisnet.org/images/file/78196572788.pdf
    • https://nileagriculturalindustries.com/file/31669591285.pdf
    • http://i-daa-wl.de/userfiles/95521048825.pdf
    • http://esllearningbydesign.com/app/webroot/files/file/75129536204.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145baaca898c---46820656338.pdf
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76401250024.pdf
    • http://sghr.ca/upload/ckfinder/files/fododijolig.pdf
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/wesesituwixila.pdf
    • http://auburn-companies.com/userfiles/files/72699674154.pdf
    • https://alhurwallpaper.com/Files/files/fofoxixazonakute.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161393dd66a5ea---dadawuja.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_off0000e892.bin
e74e7ddaa48fb9c4866ebb0e4fbea0c5affc68bfc70cff057abd56fb426fb627
pdf-font-stream PDF embedded font (sfnt) at offset 0xE892 19716 bytes
font_01_sfnt_off00011b7f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7F 16792 bytes
font_02_sfnt_off00013396.bin
20d9622d4c7f651bbf2ca3463658640b43b25b20def2591368fc34d92949d188
pdf-font-stream PDF embedded font (sfnt) at offset 0x13396 10796 bytes