Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffc30b4cdf9daaf4…

MALICIOUS

PDF

78.9 KB Created: 2021-07-05 21:42:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 88c40f9c6fc86e0374ca9edc38d77c0b SHA-1: a164f1ba67131017341103da5ce251afec344d11 SHA-256: ffc30b4cdf9daaf4c3964608c2890eba72c06554fd9800255b4e6268bdd9c20b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites, 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 distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs point towards an attempt to exploit users via malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b86451708ab---zidodi.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/27025e140d6da8cb34e2cf25678b156c/94758420471.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608f28056b356---85027099195.pdf
    • http://alpanelektrik.com/depo/sayfaresim/file/vuwijomomidufinerifula.pdf
    • https://ms01bet.net/contents//files/36901902054.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb304a39f8---xafipeg.pdf
    • https://cornerstonelaw.eu/userfiles//file/14295731282.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16093cfbb8a4df---pulilerivesufisufopol.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/efe454432e94e16d5ceec6e6971a09cf/67106999249.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/8a87bfb49d0802ade87d375333e57e6e/33855308905.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/5dn29kp9v4tto90fat74aes47h/wixili.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef459dae78---36221014673.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ac47e1354---sunubegusag.pdf
    • https://uleshuzataruhaz.hu/files/file/14855664331.pdf
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e9da91bd5---44628969898.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac1f12314c---25256793922.pdf
    • http://aaz.sk/editor_uploads/files/74248635520.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a11d12ce8---43986608669.pdf
    • https://aquafilling.com/userfiles/file/rusak.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721f3595c53---jefixoluligowag.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=software+to+convert+scanned+document+to+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_off0000d1a5.bin
a696ac5d733380a93ad65c29592d514b511c65799b33f8933057056b22757db6
pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A5 16732 bytes
font_01_sfnt_off0000fcdc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDC 16792 bytes
font_02_sfnt_off000114f3.bin
531b0f8ef24b9baef9500301c7810ce83dc464a2a6b8ef66a4beb963e8c80744
pdf-font-stream PDF embedded font (sfnt) at offset 0x114F3 10972 bytes