Malicious PDF — malware analysis report

Static analysis result for SHA-256 459c234232168e8a…

MALICIOUS

PDF

81.8 KB Created: 2021-09-03 22:42:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 0d64308292eacf7a4c7231d0596fc624 SHA-1: 65854b4f289a498a768204b8979c41d4ae9a171a SHA-256: 459c234232168e8a405855714df6b815d7ba26d07c519d7bde3e30b4bb38993e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://ttmplus.com/userfiles/files/tebonerezekolukigamit.pdf In PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/b15b6c7b8bd52c9a75c4cfa71fdf542d/gumaxefatunedipo.pdfIn PDF document text
    • http://sdes.in/uploads/53297244627.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/ac362c34da579e823a0cd79a796f8267/25078584598.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/40433901856.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/9697279738.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/43877521863.pdfIn PDF document text
    • http://cjatkinson.com/userimages/17238482227.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/gibafakebu.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/gebarobolorumafexajimaj.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/f9b9071fd94200ff79e5a9a58d4681b7/vadikebesodi.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/pupefer.pdfIn PDF document text
    • http://calhi1974.com/clients/46234/File/jolaliwirosilubuxavup.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/zexojamopuduguxitusana.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec0a44842f---mudobamivarozepotozupeb.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///202107315649_1025688026.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210825_5F3A0E6B192428A2.pdfIn PDF document text
    • https://baglab.pl/galeria/file/51476291143.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/0eb23e6bdd637f11d5a8b696235a5328/gawisesudisawa.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/77920597786.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612828340583b---93101468104.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096b39beac15---41423303063.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/mamunewitaxutajib.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84d2628dfe---3901285369.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608540acb2f2a---48858277022.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=diabetes+mellitus+segun+la+oms+pdfPDF link annotation
    • 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://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_off0000df74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF74 17880 bytes
SHA-256: a862ae05cee6fd012654e5e4f3431d9e70816f78188a4cef36c6e31f65ba847c
font_01_sfnt_off00010d60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D60 10984 bytes
SHA-256: 2818d4aaddf3f58638a8d51af2e7d029e17b22361689439744ca91e59277ce12
font_02_sfnt_off00012670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12670 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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