Malicious PDF — malware analysis report

Static analysis result for SHA-256 c708fa8041c2b3e9…

MALICIOUS

PDF

84.0 KB Created: 2021-07-14 08:45:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fe53e939ec3b68b7063c56947628f5f7 SHA-1: f3256dc668307bef335784cca377f769890255dd SHA-256: c708fa8041c2b3e966aa5ee23c8857e291155efc2f3816697ed98e0e782a7396
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress upload directories and disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. No scripts were extracted, but the PDF structure itself is being leveraged to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160782a7f7748f---golujalexevalo.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609195ec4cc4d---88457021238.pdf
    • http://aftckwt.com/uploads/file/27115581147.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/1h11ua9beg9kithkjgdfo0qkfs/15065417180.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca4d5a6dc0---77646057819.pdf
    • http://bettaletroom.com/file_media/file_image/file/tezifa.pdf
    • https://securityguardsupply.org/php/uploads/file/53448896736.pdf
    • http://humanitool.ru/userfiles/file/9935275958.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc33bbc462---86041688308.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/797ebc83762f98bfa66ba897eb57d3c1/33779851091.pdf
    • http://ledseoul.com/userData/board/file/girerib.pdf
    • http://lohs69.com/clients/82366/File/84547546380.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/a79d29c0ca3332ac056930219fef18ef/49255978839.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/2c7cb73449f53146db5cd4d3ebe4a4a1/kifagi.pdf
    • http://taxicityplus.ru/userfiles/file/75226758822.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16098a71b14fe6---kenivumazeroguti.pdf
    • http://antiochhighclassof70.com/clients/4/4a/4a4d67c83f6236388cbe8d22d68d4f91/File/89790122791.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b50a650c397---93925510984.pdf
    • http://www.findvoters.com/userfiles/file/48666003284.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b80ca715c9---vemakovapit.pdf
    • http://riskhedgetech.com/uploaded/file/129072199460d56ae20b9ea.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/615f2819a290a4312991f96812651c62/jetudabodenajubo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+put+a+child+to+sleep+fast
    • 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_off0000e60d.bin
3f59bcd08d6bcd14f2343a82f677227e20d3c9a70cb7b4968fda52a393e7aef2
pdf-font-stream PDF embedded font (sfnt) at offset 0xE60D 10688 bytes
font_01_sfnt_off0000feb6.bin
99b23c8799dcd27177ffb873276bd127ec3e50c8177040c2cf68a03839335324
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB6 16852 bytes
font_02_sfnt_off00012aa6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA6 16792 bytes