Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f4ed3207ac4f307…

MALICIOUS

PDF

123.0 KB Created: 2021-08-23 15:10:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4ea5ab5d363eacc7df68875804c8fb79 SHA-1: 73b125b262d2158342d3739431ad71fa1fe69e57 SHA-256: 9f4ed3207ac4f30710856f69a6cbf8760989af63c0aca4abfd5e65bfb9e9309d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating it is likely a phishing or malware distribution lure. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the PDF structure and embedded URLs strongly suggest an attempt to lead users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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=tamilrockers+tamil+movie+collection
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/201ae438b88a516bc551b2839bfb16bb/javufafowafefexudapamob.pdf
    • http://globalsocialwlefaresummit.com//app/webroot/uploads/ckuploads/files/sodokabomewejotututaporo.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/o50te7qvbc7lkliqbglhshr8sa/3711823124.pdf
    • http://galgalesh.com/userfiles/file/69488825727.pdf
    • http://dieta-plus.pl/userfiles/file/zevadupekonotivalimuva.pdf
    • http://firewheels.pe/userfiles/file/37107700401.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16086a4c524e46---laluxexidiv.pdf
    • http://universalestetic.com/userfiles/file/488307966.pdf
    • https://mimpi1pusat.com/contents//files/80409465654.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16088e67250273---karinawufiroritenume.pdf
    • http://www.verneteco.com/ckfinder/userfiles/files/mavemitava.pdf
    • http://www.alexgis.com/siteuploads/editorimg/file/2694037725.pdf
    • https://hutechsolar.com/upload/user_upload/files/25005517030.pdf
    • http://iccj.jp/images/uploads/fckeditor/file/23193577356.pdf
    • http://enotecagaribaldi.it/userfiles/files/92030354176.pdf
    • https://stcc-sa.com/motakamel/Ups/files/85193734920.pdf
    • http://bioident.pl/photos_fck/file/39605797419.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080eb9c8d62e---88179467691.pdf
    • http://servmed.net/userfiles/file/loteri.pdf
    • http://morard-mcf.fr/data/Files/romiwosobeg.pdf
    • https://holocaustresearch.pl/nowy/photo/file/bewosana.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/cg1kbj3moaks1q8r55o2k1dhf3/puzejezanapazisilawilel.pdf
    • https://signika.pl/Upload/file/65187691480.pdf
    • https://hospvetcentral.pt/site/upload/file/848026373.pdf
    • https://debcopharma.com/userfiles/file/kadutajolig.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_off00017bf2.bin
2ef015dd6d039ee51a718cac3cbbaffb6f5f875d8a0103f3c9ecbf61e9dd8a0f
pdf-font-stream PDF embedded font (sfnt) at offset 0x17BF2 18388 bytes
font_01_sfnt_off0001acd3.bin
55b78d84cad355dd7c2338ea4007fb8ee1066ccfb196a6d4f6ddae57b6974834
pdf-font-stream PDF embedded font (sfnt) at offset 0x1ACD3 10512 bytes
font_02_sfnt_off0001c4c8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1C4C8 16792 bytes