Malicious PDF — malware analysis report

Static analysis result for SHA-256 82936875e26d1f8c…

MALICIOUS

PDF

178.2 KB Created: 2021-06-27 21:42:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9436d2278817d691f01a3915869f27f5 SHA-1: 001a3d7557d2e22d5571d928b84d0e8dc8806a0c SHA-256: 82936875e26d1f8cf6bea6bac332e43359e5888313cf43054ea0573e84036390
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites, many of which host further PDF payloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests exploitation of PDF vulnerabilities to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9894

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://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/ujj2mot196uombahv23urauv7l/situbimarenedup.pdf
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/1355d172f544f6a795353ca96b7059ca/11180824032.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/9lpdcnf8kh4fodc72bd7vb88ba/letusumapumebufow.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607021ee1cd7e---zumavovaribadoxapu.pdf
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/3ilm7ar9h6cb0ht0j1h567r6b0eu3d5r/86791738461.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/501535d1a2149b02618be7bff3b2f7de/wajuvizimije.pdf
    • http://shsalumniauditorium.org/clients/f/fa/fa32e32112b7cad64a7d7e78b95ed61b/File/57887097993.pdf
    • http://sosnovgeo.ru/userfiles/file/30991802658.pdf
    • http://gancza.pl/userfiles/file/ximigemesabisodetozem.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/2u4pkdsn8a8ekjvf61scepf5jo/fesezubasefovebupilodabu.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8a6a7b00c---nebuled.pdf
    • http://manixcnc.com/ckupload/files/gevewilasomijisalojit.pdf
    • https://laetitiabernard.fr/images/file/febenijuje.pdf
    • http://styropapex.pl/userfiles/file/78676524795.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609207534ef64---pisefabujifawomiriw.pdf
    • https://toskov-yordanov.com/userfiles/file/pipozenetewuk.pdf
    • http://ahcxdq.com/uploads/file/082222321256.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c8c3eb6e2---66725927038.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16074089eadb03---midosuluseromabis.pdf
    • https://sasalidayanisma.org/uploads/file/60174547956.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=can+u+play+zelda+on+pc
    • 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_off00021d0f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x21D0F 16792 bytes
font_01_sfnt_off0002351d.bin
1419bd2631398c708176a24212e42853aeb39dc6d3a00d9c32697d4d4626f019
pdf-font-stream PDF embedded font (sfnt) at offset 0x2351D 20708 bytes
font_02_sfnt_off000273a0.bin
8f52b2197b8939bd442621d9e1c764d4573ae3c70ebe22dfbef378e1052341c5
pdf-font-stream PDF embedded font (sfnt) at offset 0x273A0 18372 bytes
font_03_sfnt_off0002a356.bin
b138d44ce73f1b4a058674d6e680c642efc5e91150e2d953fde44e60bd27cee3
pdf-font-stream PDF embedded font (sfnt) at offset 0x2A356 10356 bytes