Malicious PDF — malware analysis report

Static analysis result for SHA-256 e101106320857fc5…

MALICIOUS

PDF

79.4 KB Created: 2021-07-26 02:10:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ad368dc0cabe91f5bce0a63cb356fca5 SHA-1: a4a8f1e298e8ba55f240d68c45a3e08b61c950c2 SHA-256: e101106320857fc56bd6c2ac1abaa2890003f9a939b7f16718eff967a7ea6d5a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS upload directories or disposable hosting, indicating a link farm for SEO poisoning or phishing. The ML classifier and ClamAV detection strongly suggest malicious intent, with ClamAV identifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/3h0ic7aioabhh2e4cjj1hcjol3/tukesejufapuwosadomak.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/b8809d5c9119093a0acc2e76248ef39e/90729321102.pdf
    • http://gramercy-grand.ru/files/file/29981435465.pdf
    • http://prttour.ca/FileData/ckfinder/files/20210624_4B59D94878FB9C9C.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/21b445967f2fe5ca0d86313af65d0f0e/fiber.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a646b1240eb---zazagigikobaronuzupesubon.pdf
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/voxijamatofegasume.pdf
    • https://egyptsuntours.com/userfiles/files/faxuxakubonavobewet.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e5b2b0d76ec---79072386196.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed0470459f---doziwotewixirubuxabituwak.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160c915320972b---pexefusavokowibo.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/0666d8eb40388e8216e4b17662aac289/worebig.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/93b015d7985e5b0cf750778061c37396/17681917880.pdf
    • http://oresteruggiero.com/userfiles/files/70180226059.pdf
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/ad533857a758d7a946d812b50fcfa1d9/67177356229.pdf
    • https://lionkingbali.com/uploads/file/vixinaxesirubabe.pdf
    • http://www.proyecpapel.es/ckfinder/userfiles/files/fuwijujupasetikexolekemu.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/853f76f367425e51a5af845e23f93e1c/95727514135.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160842392ed30e---823609750.pdf
    • http://medizator.ru/ckfinder/userfiles/files/pipesunel.pdf
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/p8m40ccgt80092e5omklrh3lk9/bekapemab.pdf
    • http://project-lovcen.me/userfiles/file/16240924453.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1f0aebe0a---bisefubemomaborajidugudef.pdf
    • http://steakclubhn.com/campannas/file/87974987398.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=prelude+to+programming+6th+edition+chapter+5+answers
    • 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_off0000d01f.bin
07c69a40de2ad9b25b9445d36474e55cae205db27f2481ed54293e0b78f2774a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD01F 16948 bytes
font_01_sfnt_off0000fc63.bin
114a17b4b3c5a0fb58a5978cc096dbffb7cdaec910301f214dac28359f5b5894
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC63 11452 bytes
font_02_sfnt_off0001171a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1171A 16792 bytes