Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8f89523e2171f90…

MALICIOUS

PDF

84.5 KB Created: 2021-06-29 06:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 047515ec00154d5c0db746ffc56981b1 SHA-1: cedf3b8a8236d03ecf79a8bd8971b9707209fe3d SHA-256: d8f89523e2171f90149d6abfd94639436ac58a02766267b98a5d24d19ee709c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many hosted on compromised websites, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c6de28ed49a---23732553796.pdf
    • http://goref.ru/files/file/68002618921.pdf
    • http://interel-rus.ru/test/sites/default/files/file/bejetijokepera.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160ba407fd76a2---mogagologusupokiraxos.pdf
    • http://stasta.com/userfiles/file/fozub.pdf
    • https://its-bulgaria.bg/files/file/wubozuxesudiwifigumu.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160942daa2f244---56431283648.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/3b73e4dd67cdac70808cf9c68b95e8a9/93331835557.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1aaa8c607---nijimoz.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160899f2a51c82---98287618178.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/cfd38288c932884307d2897a0c7907cc/botakojikov.pdf
    • http://ewtch.com/upload/files/zipirinofikofij.pdf
    • https://esperanzadeavila.com/fotos/file/repisexegew.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/782bd5fc22a17d9817d0870aecd64771/27738147308.pdf
    • http://kangs78.com/clients/66216/File/28105048474.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075be6408936---74628069055.pdf
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/n2oalf9l142855m8otojiai6e6/87275233725.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ca63896a2---pufij.pdf
    • http://busankid.com/webfiles/board/file///67473193671.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f80141c787---sivedabosivawafofot.pdf
    • http://limuzine.md/userfiles/file/perifuvafotemubilix.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608740cc06d68---73829389231.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160867d88e1e9c---giguseliwaxanapuvijo.pdf
    • https://digicpictures.com/downloads/jutikuvosumulajotoloxezu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=download+activator+for+windows+10
    • 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_off0000e8e3.bin
22bab89e9c9219360466c4009b2f58fab3ba7dd8bc242e5be5eac19c90d76787
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E3 16628 bytes
font_01_sfnt_off0001140d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1140D 16792 bytes
font_02_sfnt_off00012c24.bin
8b8e36d6a8171aecdb0033b1f238d2a329f0bbb2490428f743aeaac683fac752
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C24 10664 bytes