Malicious PDF — malware analysis report

Static analysis result for SHA-256 a713d50119f17a16…

MALICIOUS

PDF

148.6 KB Created: 2021-07-01 10:08:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 855ecbe139caea61151b1df5e55f5ca3 SHA-1: 9777013a3cea0ebefc93d30c11f09c8f8c64e035 SHA-256: a713d50119f17a16b2172cceebd87c5aaf05be9b158a694fab72c4c191a7aa78
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to domains that appear to be compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the link farm structure is a common tactic for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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=lucy+hendry+barrister
    • https://kisikana.hr/userfiles/file/xomakosemofuvodava.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/2c10e7d75d50ba2d91d489b78859cf21/kejunojevaberezukaxubizu.pdf
    • https://ocbond.org/userfiles/files/74971906461.pdf
    • http://soldresold.com/Shradhdha-Mehra/soldresold/final/ckeditorimage/files/bozenanoripo.pdf
    • https://www.carrentchiengmai.com/files/87263545883.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/oh18bqvst8fodrtkqcg586suro/ninapu.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ba24ef5e7---61660424878.pdf
    • http://www.fonfe.com/uploads/files/86513397389.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870a9fe122c---famake.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c71c18361d---kedukadagejakaji.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/1f325b6d142171f14e83f18115b56f6b/63669936496.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/9b0f121205bf0a929c9df0a6983d236a/kikelivusumuzo.pdf
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/xinaxovixezilurasis.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/f2c1756612dabc022edd8b44612985b7/logedulup.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/4ko0ruk3a4b5cku9snlbe2179r/julavuxevof.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f8674a572---56178038460.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/ab972894074c3d339c5d2daf6b52d176/gebawawafajisuzasebo.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16075849dbaeee---5988298153.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd13b42e7f---20453079016.pdf
    • https://securityguardsupply.org/php/uploads/file/nisironufenufemosiloze.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1c7e99c14---lapisazili.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c69dd556ec0---wasiwipewazatesok.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_off0001e3b6.bin
f72960e4f13d5ac8e1c9ad7759ce4c6e86a6f6e174bd6330105a14a2917c19f5
pdf-font-stream PDF embedded font (sfnt) at offset 0x1E3B6 18744 bytes
font_01_sfnt_off000214c5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x214C5 16792 bytes
font_02_sfnt_off00022cdc.bin
50d9d15798291943b97e8e410754ace7b91539ec5055456a128dda038b47433a
pdf-font-stream PDF embedded font (sfnt) at offset 0x22CDC 10612 bytes