Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab8ee6bdc540f8e4…

MALICIOUS

PDF

69.7 KB Created: 2021-09-24 15:32:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 21bd7e26e497f73c98368a319745ecc0 SHA-1: e0f975c45b433df8f01af6c73796c730edab1f88 SHA-256: ab8ee6bdc540f8e4bf6d33fd5674b68473d53a6a43283de5db08d6ed38af67e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://laborke.ru/uplcv?utm_term=power+spider+man+2+mod+apk
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161479cd2c5a51---72456378214.pdf
    • http://scandirent-new.ru/uploads/assets/file/mefapu.pdf
    • http://plnjl.com/userfiles/files/46353655594.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ec11cbc73---nodivamexutesisas.pdf
    • http://studiovalecchi.it/userfiles/files/wovatuz.pdf
    • https://brianhigbielaw.com/UserFiles/file/44147338024.pdf
    • http://stonestudio.pl/files/upload/file/47485701054.pdf
    • http://salman-is.com/userfiles/file/divererekimamilapedifimad.pdf
    • https://kermanrooz.com/img/files/nosofizezubisuj.pdf
    • https://ku4ysk-9lgp4y.com/contents/files/14479378640.pdf
    • http://flyingwedge.com/uploads/assets/file/naxozukipinemuxilotub.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/4697b939a7a5716fb0261617ca0a8db7/fosabegowadunemek.pdf
    • http://cozycornerexpress.com/uploads/files/87350450158.pdf
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/88225941905.pdf
    • http://skogsformedling.se/bilder_umeny/File/48867286649.pdf
    • http://brezov-gaj.si/uporabnik/file/29710293797.pdf
    • http://severstroysnab.ru/userfiles/file/sebitekexinewav.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/8e36b07bde06ec153a94da041c804426/binapivivugijitutebu.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/uo715mcsfm6ktmj8os0gens5ir/vagowipabalisesivowa.pdf
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/suzojupomemotu.pdf
    • http://digitalpolicycouncil.com/imagenes/file/redimogubopejabo.pdf
    • https://mallarpurnaisuva.org/go/file/webokumibasejogesulivurik.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_off0000b11a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB11A 16792 bytes
font_01_sfnt_off0000c931.bin
714f23d06aab139a50ea2792252a8c3261c712fa33da822a5a49f8435467e31f
pdf-font-stream PDF embedded font (sfnt) at offset 0xC931 10708 bytes
font_02_sfnt_off0000e1df.bin
59e977c5afa7c5fe5d4360aec27a520f106689c58ba0f643ae86ff8bfad07c71
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DF 15444 bytes