Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f812d08e4ae5b5b…

MALICIOUS

PDF

90.5 KB Created: 2021-07-04 01:05:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1199b85ba059edee20a3c99c1d0fb4b4 SHA-1: 51bfb3a7129580d7f12472e8aa0dd1a560ffea48 SHA-256: 7f812d08e4ae5b5b112d654f1c11fcf0928117f04115a87652e2f36220028081
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to numerous distinct hosts, many of which are compromised WordPress upload directories or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document body is heavily obfuscated and unreadable, providing no direct textual clues to its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://habibitours.org/ckfinder/userfiles/files/46385110941.pdf
    • https://badrivishal.com/media/kafodifuzalapowetidin.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/gbr4q4qcmkin8oostta51hffm5/81537473090.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa100bb542---givejuzebikupuzizinitejaf.pdf
    • https://bomberosdenavarra.com/userfiles_nexo/files/nereretovi.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d972c4265---6576213327.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d24bcd4545---83990454774.pdf
    • http://np-laser.com/upload_fck/file/2021-6-26/20210626090355444630.pdf
    • http://vksraja.in/fckeditor/upload/file/bavozo.pdf
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/q6nipao5n3ksjfqt90sd73kb3l/69228489904.pdf
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/4e90d15e3bbdff1a424b1a309ba0a45f/zijevarudumisinimigi.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e050488ec9a---50135765786.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/b4c0dcfed8c6607663643faa85c1eef6/30351793367.pdf
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/0698bc1464d08b6877d98e58022cab2f/fegowobonununifaritedevi.pdf
    • http://vistobrasil.net/uploads/file/93018959408.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a47d84f0e13---tiwavixubivexud.pdf
    • https://kuzeyilac.com/resimler/files/95406720617.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e0cc3c45e---60283780716.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160897b1171bc0---gawabarisunikutiroweg.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/363aab7512500154667daeeb3e14734a/mutititaraturerimile.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/o9f314pobgm8rfh5p731s5t450/guxogawevorabadivakowop.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e18962053---rosuvudofonuxejar.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094808d40441---54861721715.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=small+waist+big+belly
    • 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_off0000ffe9.bin
e40bd6abd5ded16e5bfa57f90afbe5faa2e8cc3f238f57e542961a31532a75dc
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE9 17148 bytes
font_01_sfnt_off00012cdc.bin
ea6deaab082518add98714cc75f0520b9879565b90dd1b7991ef2045b9b22320
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CDC 10544 bytes
font_02_sfnt_off000144fc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x144FC 16792 bytes