Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac2ce86b4436b6fe…

MALICIOUS

PDF

88.4 KB Created: 2021-06-28 23:54:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4523ecec46e4a371080268f6bcad0f45 SHA-1: 2495969bb219e3271a374c1202e7cf12bd017796 SHA-256: ac2ce86b4436b6fe2c224cacfb88b80a7c63a9675bc3fb1b619d2b9c5981b31e
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress sites acting as hosting for other PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded links suggest an attempt to redirect users to malicious content, leveraging compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/c3a88208a81fbc3c56c2f05e983a54a5/wofamamisimogitonafid.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/bcd2f8941747b214c39349d782f2c033/61785746495.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6ac13f345---kevimefozogodirosupokub.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce3c448650---41570150326.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d5d3e5b0a---putovubi.pdf
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/79042a72749c2adf40d0ceb7815e6685/bujowogotokefuli.pdf
    • http://cmuniontravel.com/userfiles/files/luxululu.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607527faea1a4---kebapen.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a572ef64a17---kevesobunoz.pdf
    • http://zimaletto.com/uploads/file/jetol.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073737866a5b---3469100476.pdf
    • https://pmeds.us/userfiles/file/nujabokikudasuzarumik.pdf
    • https://vieclambanhang247.com/upload/files/37960432128.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6ab7a4ffa---jimuwakisanewodifozaje.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/1gs500hvms9kagqqsg2lbpffvj/mozuvuwodine.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/863221533fe3d4a1494de0fe8842257f/besaw.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/dg44gu20v45dcjcffhvis2rnr7/42637709152.pdf
    • https://bmw-zona.ru/uploads/file/29097429246.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/5f75772bba8b02949ec5ea8d50d964e3/70530745915.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9b9d31f40---folukaxi.pdf
    • http://twxcd.com/img-aim/files/jijenodagoxotus.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7adb7edeeb---30658031514.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/aad7901ae1573bad618cd78f4d7f63b4/39632438240.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=melodic+groove+metal
    • 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_off0000f21d.bin
d58ccc0c5d9205f685b88aaea13f6c5de84b3dd889db64a2ce448cfa5062a062
pdf-font-stream PDF embedded font (sfnt) at offset 0xF21D 19384 bytes
font_01_sfnt_off00012385.bin
77b742a98d9a007a8fed2058c445bff1e0f930b5541f056a9fc45bb0c8e4fff8
pdf-font-stream PDF embedded font (sfnt) at offset 0x12385 10500 bytes
font_02_sfnt_off00013b3b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B3B 16792 bytes