Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0e39e6cacf67166…

MALICIOUS

PDF

85.5 KB Created: 2021-07-03 14:53:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bfcf3e437bacb8b4f5ef489b3d2300e9 SHA-1: 1ec28b3078e32e5406fbe5ab24528aeb945b20d0 SHA-256: a0e39e6cacf671667f3191933d48e786be98a33b5e0353949559d75b9ce7d1b5
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML_NYX_PDF_MALICIOUS heuristic indicates a high probability of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e431f3bbf---47755518188.pdf
    • http://drshapard.com/clients/73598/File/febejutodonidimuxasibor.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9de60c571---sitivikuwezis.pdf
    • http://ilyxrace.com/userfiles/files/lusudovir.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4b52966f9---70188637169.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608624ed2147c---lozuwibejamiget.pdf
    • http://alumcity.ru/userfiles/file/kosunutarezetagegaj.pdf
    • http://jcbcharpentebois.com/ressource/site-image/files/34103009801.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bfaa8fe2586---47813934535.pdf
    • http://bisenzia.it/userfiles/files/benumemeluwijepabovepe.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/eac5c89606538ae335e3fb631e172e8c/11144779893.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/9288a4cc3341db975f9babbece7661c7/jajemavopukekavu.pdf
    • http://spreewaldatelier.de/img/editor/file/gewexadobofinidobu.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/a7380ea77ec31a097647b707f5297e17/tenazuvosaxebowebadud.pdf
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bafe2927768---fadedudotil.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/444a7b1fac958956d6bf2666aa2ee42b/jaxupelevijawojalag.pdf
    • https://fullgame.hu/uploads/files/xejixanejizunenogurasa.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/furgeiauhnnmg5j2brafftdfcd/43334758666.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/vpa1i8g8dbornseoj8vcgv2c27/65719999685.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f82fd15832---zujoravepit.pdf
    • http://kingnature.ru/files/files/46820171007.pdf
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/12118866605.pdf
    • http://dabaizhongxue.com/upload_fck/file/2021-5-18/20210518063522553842.pdf
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/79e78aa2421a05738fdc9daa27c1a72e/fujutofibagewepural.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=continual+feast+meaning
    • 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_off0000ec1c.bin
8f6b528404698fc166fff82421b4f96c484418d351ddcfbd4ffa1f234abe98ed
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1C 17344 bytes
font_01_sfnt_off000118b3.bin
8f0713a217d92492d9820814c096a017e6896530618d7f4e00b73b14267d2049
pdf-font-stream PDF embedded font (sfnt) at offset 0x118B3 10588 bytes
font_02_sfnt_off000130ee.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x130EE 16792 bytes