Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bce38f30a932990…

MALICIOUS

PDF

81.5 KB Created: 2021-06-28 11:55:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b032bf6244de65d96be180754dd10b77 SHA-1: cd13855bde5826d12a93a47946ba768ff11464d6 SHA-256: 0bce38f30a932990d764eacabc4836674428db15a9faf2e7f6ac6c408d61ca91
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristics reveal it functions as a link farm, embedding numerous URLs, many of which point to compromised WordPress upload directories. These links are likely used to direct users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16083e9eec92f7---bugozakarud.pdf
    • http://mobydick-band.de/fckdata/file/xojekapideme.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7d07ac708---38185549604.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5cdf5a895---82270911367.pdf
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/1ec3d0b49662cc3f408294c4d3824b2e/36476449351.pdf
    • http://southport1969.com/clients/861680/File/jegewosiremufawukasaleg.pdf
    • http://ekolojikweb.net/upld/userfiles/file/59220185286.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/ulhuncaij9urdul0i94g29es7t/37141982791.pdf
    • http://adance0112.com/upfile/editor/file/53377674453.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755a8acf047---99748687007.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16097e40c1db27---57333003941.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4e5e3fe01---21222799330.pdf
    • http://asbufestival.com/uploads/FCK_files/file/mawomum.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160b29ff07a605---lopunuw.pdf
    • http://www.findvoters.com/userfiles/file/80159450452.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc026d72367---wetepumozepidupi.pdf
    • http://chia4kids.ru/ckfinder/userfiles/files/48246817070.pdf
    • http://tutaylamhet.com/storage/ckfinder/files/70862206439.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160833b2808cb9---51971025959.pdf
    • http://bajajsports.com/userfiles/file/33977437006.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/8a182bf64cec13d85d966c7124267129/fotelisutajo.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a1b651c23---bogokab.pdf
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/e4feb1f5a497928952c960bde3bdaf8b/popeb.pdf
    • http://cherryontop.pl/upload/fotki/file/13173509758.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=oh+baby+forever+you+and+i
    • 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_off0000d12b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD12B 16792 bytes
font_01_sfnt_off0000e93d.bin
57041754ca4a4797b4dc017429860c602976bcdff3ed9edee2836aa36eabd48f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE93D 26144 bytes
font_02_sfnt_off00011f10.bin
51afcb02375e7bf336dc69414cab0454be363c4dc980be43e21057dc23ce5fca
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F10 10584 bytes