Malicious PDF — malware analysis report

Static analysis result for SHA-256 a21843b1f44dd7ea…

MALICIOUS

PDF

63.7 KB Created: 2021-06-07 20:45:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02ba763d7ddfb32d1eba342c6ee7844a SHA-1: 942509627ccf17c32b2e83c70cfeaec578e396e3 SHA-256: a21843b1f44dd7eade980bbede435d1e839a63c9708b2c7b192fbff679400ad6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous external links, many of which point to compromised WordPress sites or disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages. No scripts were extracted, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8608

Heuristics 5

  • 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
  • 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://allytemp.ru/uplcv?utm_term=tabla+de+constantes+dielectricas+de+solventes
    • http://apartmaji-zunicmile.com/uporabnik/file/35424843306.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1b6691092---didolewot.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/81f8eea51ef98ccc2e009f47be02e1c6/80384236392.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eefc5b8191---zexotumefofilezodir.pdf
    • https://nikosdimos.gr/userfiles/file/fokipexiwoxufepage.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/8bf2096e07d4a7cd6877da9ac6771c33/85594637008.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1b1b4dc8a---56301060372.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/chfbmpfl37t8g6fpgt7c5k9gi4/69372256118.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6e828676b---22324812634.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872b768baf1---nawasopuxop.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/cdabcdd34647d7cff968c5ffae8bea53/zijuvuranijefaxupujewuwow.pdf
    • http://mu-rrrc.com/userfiles/file/sisunofevupobi.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/c33c92905a2132897e0654bb27f76bc4/47921289702.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7eefb75621---3251642093.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608948019f764---wakuxizubabezezemekijux.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d748.bin
5d375751022f3b1274a4a18311c5aea46880ca960207954b33de1ed6c2209bcd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD748 5084 bytes

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