Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f97931e70305dc5…

MALICIOUS

PDF

88.5 KB Created: 2021-08-10 07:14:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 573149e94a6b5084f7cc6eef7a3a8cf2 SHA-1: 609d8a537a2558755c62b2a9777ce315447c8d7b SHA-256: 8f97931e70305dc55efdf15e51499e815a483ae5ead3a317d1d800d882b4b810
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and the compromised CMS upload link firing indicate a strong likelihood of phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://synerhu.ru/uplcv?utm_term=what+is+supply+chain+management+process PDF link annotation
    • http://alexlunacoach.com/img/editor/file/43522958.pdfIn PDF document text
    • http://kanizsakran.hu/userfiles/file/60343594082.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/n2c0mv0am2cooqvemnj7obsa62/widuduredilovumukatonaf.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/80k8bmfnt3f2kc87fskrbhr053/tutulofoz.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/99317925977.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/94849094738.pdfIn PDF document text
    • http://veribase.com/E/file/83602458102.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/45696217683.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160930d15a23b3---79998821847.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/fopavi.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/1054842485.pdfIn PDF document text
    • http://luxe-pools.fr/i/File/jaziwebon.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/ziritafitivitizi.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608263e3023f1---fuxafezakolujuzituropona.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d8166983d---38214670416.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8d53ab17d---53186962705.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/65249836900.pdfIn PDF document text
    • http://abpaluso.com/upload/file/92377046558.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/kigasepezoxarivixov.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/70903422220.pdfIn PDF document text
    • http://jpbullies.com/clients/2/2c/2c827f09d77a589c2c5c7da8c033a3f4/File/surenuxebekituzeposazise.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c9b943791---lasaxu.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/67d9112ce7890009677ae0d3787fe88c/gupolalazaxu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E07 16936 bytes
SHA-256: 64c5a245783212e38112d4ed8c5f21b024bcda749cdadaa965df67280a50df5e
font_02_sfnt_off00013a62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A62 11028 bytes
SHA-256: c06a2de6f7cfbd2d35083d2ebb8b118f388bc482538a5f9d82c9015e80496531