Malicious PDF — malware analysis report

Static analysis result for SHA-256 847e82792d741cb9…

MALICIOUS

PDF

90.5 KB Created: 2021-07-04 00:09:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b540ca5cae4d937d9e234b76fb716dce SHA-1: c31dfaaa8c3c0a7825daeb669b1455ac8d7f6e07 SHA-256: 847e82792d741cb90388143e0ea6701ab3a298578322ea3a06bd5d39d3e13af7
156 Risk Score

Malware Insights

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

The PDF document contains numerous links pointing to compromised websites and disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://inwebjor.ru/uplcv?utm_term=written+statement+example+for+court
    • http://capmar.eu/userfiles/file/vogudonilefovisalaboludop.pdf
    • https://mclandpin.com/calisma2/files/uploads/doboruxezugupikotafut.pdf
    • http://stardentalcare.org/userfiles/file/vebofopijemitowa.pdf
    • https://defrokatilai.lt/images/files/ridejiwinu.pdf
    • https://datatech-int.com/userfiles/file/numarezin.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/fgah6pk5vt610jg9d20f7udb3g/45849940708.pdf
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/c127b90393f24dce37a288300e038ec0/morafozimunapene.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/7rj50l0m3do5prg6t1pmtueuf0/89134204483.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/c602b94edd0d698c900874669da64ffb/gigejexadozazenu.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/7ap7io3gsdclap7v2obfe2mpre/gilubibefapolebowub.pdf
    • http://tevukasveza.lt/ckfinder/userfiles/files/37356253178.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16070ebacb8461---96139628294.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/orvd8u74h25bsmb0h24a65i5j3/50356628633.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160dfa11a89801---31807539349.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872e802d517---11795748572.pdf
    • http://yachtandgulet.com/userfiles/file/woderoxixeraxuvejepil.pdf
    • http://1970lions.com/clients/5/57/57eb30a5877ba0c7834658d164206012/File/nunimo.pdf
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/57521241523.pdf
    • http://strahovka66.ru/userfiles/file/tidagomumerituwexu.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3d992b3be---lexufumidaxafiko.pdf
    • http://angelcabrera.com/FCKfiles/file/20535762706.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c3dc063e901---vepositobapukedafozozewon.pdf
    • http://mousike.it/img_ins/files/disizojubovufizoge.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_off0001003c.bin
2569f8893403f4e8cc587f120e0a8d3dc39e2b5e7780ad07e9a0e74f3b897b41
pdf-font-stream PDF embedded font (sfnt) at offset 0x1003C 10836 bytes
font_01_sfnt_off0001194b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1194B 16792 bytes
font_02_sfnt_off0001315d.bin
827b1f1592ca104cbbfa11d323caeea749f4a6f71b534a5ca89056fe9b708ab3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1315D 16644 bytes