Malicious PDF — malware analysis report

Static analysis result for SHA-256 5209176f21bb5fe1…

MALICIOUS

PDF

86.2 KB Created: 2021-07-02 22:57:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bab047c2f01315b2df5fd52078b8032b SHA-1: 9eedd626d3b2cd6d498855913fb2d7f88cd6c9d1 SHA-256: 5209176f21bb5fe1add50b861eb65bcda79406d30e5623c61a51f5a7ef81f4d9
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to potentially compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of multiple distinct hosts and the use of disposable hosting for some links suggest an effort to obscure the true origin and purpose of the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d0825c83bb9---23294070148.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16074c17e90f19---sotekimotuneligemutujagun.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16093edf8af9f7---vamemomadujirenisafir.pdf
    • https://hotel-la-licorne.fr/userfiles/file/revimupixoretudafavibasu.pdf
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16097ed7a6c31c---kasamo.pdf
    • https://eurouniversal.eu/ckfinder/userfiles/files/25262645754.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c66fbcecf---vudojixuxokaxevax.pdf
    • https://cremyco.com/app/webroot/docs/file/52056781817.pdf
    • http://xn--xhq021fvrwdth.com/d/files/wuvefesuxagozadegosuvepi.pdf
    • https://service-panev.com/userfiles/nizusijiwudawid.pdf
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/mafinakulanovajoduw.pdf
    • http://sheeld.org/clients/d/d0/d021426cee8527c21a172be12ef3d645/File/70180587997.pdf
    • http://syuncyoku.jp/upload/file/kerulajesajadirepo.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/583671229470e81d9023adcd9624dd16/pamuv.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cd164ce7002---14288925427.pdf
    • https://bselink.com/userfiles/file/28215049022.pdf
    • http://www.aadhar-interior.com/userfiles/file/fimogaranopidaxavupi.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/1pg8b2j8lolk5f9tmf6kb6a6gm/nosegilejepeb.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079fb9f05dd3---vibonuwem.pdf
    • http://statewideroadservices.com/clients/879378/File/15156951618.pdf
    • http://okmarin.ru/userfiles/file/54729593850.pdf
    • http://rts-wm.com/ckfinder/userfiles/files/22173158809.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/7rqa1udaootec0b0ed8mopgcik/7859199347.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/e9753ef62bc3ce62da000e637eb7d608/felegolujawij.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=happy+new+year+2021+hd+pic+download
    • http://medlab.webd.pl/upload/file/27582690785.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3a1.bin
4b82ee0b8be50322d6ce4eb44abe2096853798bb171446d796728cb02ffa6440
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A1 16808 bytes
font_01_sfnt_off00010f78.bin
881e4f176e5273070bae419d2684b3a593da74cf3148be94c126a0d2d5b0c16b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F78 10828 bytes
font_02_sfnt_off0001286e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1286E 16792 bytes
font_03_sfnt_off0001407b.bin
3bc3a522163d9cd795c1f75a5007f2491c0e0de4bb8d2770d97bd4e46656f2e0
pdf-font-stream PDF embedded font (sfnt) at offset 0x1407B 2336 bytes