Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3d245b2b6bdeeae…

MALICIOUS

PDF

80.8 KB Created: 2021-09-20 22:31:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 720d4e291019fee5040ebf38343133d5 SHA-1: 6a7cae64d4faa671971f50a57e7d741e97931fdb SHA-256: f3d245b2b6bdeeae9f34a10e6af3f6b95f9bde1fcc2f9bad59b29d66ea4eea5e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

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.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613187f059b11---gasumetafenefabose.pdf In PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/pukevazili.pdfIn PDF document text
    • https://nieruchomoscikomercyjne.co/files/file/5563160196.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/biralogajipenalokonama.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/gotamalop.pdfIn PDF document text
    • https://kimansion.com/uploads/file/jisufipiwegutedevorid.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/95661201631.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/83889257739.pdfIn PDF document text
    • http://twgo8.com/uploads/base/files/202109121850591544.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/bemunidelix.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161427fb2d0480---6559421334.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210914183136_eg1fby.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/06d58007f5a1968a2ab0e2667b2590c3/79815408990.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/bivadikilepi.pdfIn PDF document text
    • http://elfast.ru/userfiles/file/judununokujelateg.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/90402520614.pdfIn PDF document text
    • http://gerastar.com/userfiles/file/xafolebigifowa.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/jalifomesewulapedajiri.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/89644233700.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/40767028773.pdfIn PDF document text
    • http://opt-russtd.ru/data_center/upload_pictures/file/58782503321.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/95425747030.pdfIn PDF document text
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/54456359637.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/85112322929.pdfIn PDF document text
    • https://khanoomhoteli.com/basefile/khanoomhotelicom/files/tadimoxozat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=ios+facetime+androidPDF 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://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/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_off0000d95f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95F 10540 bytes
SHA-256: 41d46a904b660613740a8a6000aeba932d894abe858199be57ad62af017519a2
font_01_sfnt_off0000f15b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15B 17092 bytes
SHA-256: 4b1f6ea17882775cddb6eb9d1187d0cb2f3641a8786074b96379b6ee0a95ff69
font_02_sfnt_off00011d4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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