Malicious PDF — malware analysis report

Static analysis result for SHA-256 392a23be3639b706…

MALICIOUS

PDF

68.4 KB Created: 2021-05-06 13:57:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 227c179671048a7a87c8bdff0cc52e94 SHA-1: 442f89e79e12cb956518c803bbad8fdb3e6389c2 SHA-256: 392a23be3639b70696d4f324332c34114f5dd5e5b7ed7eb4ff2202851fa3f2d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS uploads, suggesting a link farm or redirection mechanism. The presence of embedded URLs and the PDF structure point towards an attempt to direct users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/3f1fc8895b89c44a5777f6a0c8fbe40c/26459099872.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160933cf8f2295---jatejijekoluroper.pdf
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/9a94bac45e4169e0bd75bff85b353558/14550526541.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/7f472327c92400dc686d00e76a241be9/48691437401.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9be468d87---jemilolitatuvisigaxu.pdf
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/01cc02a1505f035ec62a6209bfcc0f29/9798166410.pdf
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/63057fc0bed865445c2ae6fe9133fe53/tawisefovifaten.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/76c5f345da2447fd31c3825c12391e46/legilazagiluxexo.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16083e1d783202---fatidoxuwatigurezetur.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075bca28fda7---vediwotexotubugetuka.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090e72327d4e---85452602489.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2e6e3ebe0---80287207422.pdf
    • http://aaaexpressac.com/userfiles/file/86229989374.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160748a2e60353---fewajukunugase.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/e961f13854ca5c79fe681a54e9c4d10c/10868242643.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f007ca7710---40342605163.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/u6janq95gjg36nkpakchj479q4/57043431990.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=vertigo+head+exercises+pdf
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cffe.bin
ce55dc9ceb28280b359408fc303f76a4ab5db939685eb028b9ef5c6fca1c2921
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFFE 5420 bytes
font_01_sfnt_off0000e274.bin
6311b0875c4448c5255c5d5bef82279c52fbb967f487c14cf233a9d3d4689751
pdf-font-stream PDF embedded font (sfnt) at offset 0xE274 10316 bytes