Malicious PDF — malware analysis report

Static analysis result for SHA-256 34d440f424263de9…

MALICIOUS

PDF

102.2 KB Created: 2021-06-30 00:55:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ff7323e7fe00a4196dfd999f89a1d8d6 SHA-1: 1e63835159d01fc007a5d569299e51d15741bf51 SHA-256: 34d440f424263de96445d477d23eee67e7ce58ef157834839239eb266416d539
164 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by a ClamAV detection and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the lure-based nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://philabc.ru/uplcv?utm_term=organic+chemistry+by+solomons+and+fryhle+pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/ql4c0qe4sfdno3b9gijfscvd8j/xosuzuximofadukegiwalav.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e51d2dea4---12608131778.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/7e062a0e357487b59cf866d01cf40a2f/binipugaxatarunolux.pdf
    • http://thepokewave.com/uploads/files/8348266218.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/9d514d4abb156f4a350ed2078689ab7a/37318304956.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607f087671f81---palazilotajimure.pdf
    • https://tl-systems.hu/files/files/xewadobotuwekutew.pdf
    • https://primer-spb.ru/files/files/polubulenugopig.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/c9302467932ec08ba287211d67299d68/46804152537.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160956e3194ef2---37000230379.pdf
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/9jtdtqg63kl3trhuu7gcc67337/44279622902.pdf
    • https://actorconseil.com/files/file/kuvow.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a96cd7cbbe2---kodurobebizuvepapu.pdf
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/dd36bbe34deef393cf8f4d13cefd6936/8065150436.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0af3b4542c---14091330293.pdf
    • http://hydrem.ru/images/file/labuwojirebu.pdf
    • https://narimasu-chintai.net/jcfiles/file/42846709083.pdf
    • http://chono.mn/uploads/userfiles/files/romexa.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160db18b86d253---monigewu.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0f0e04722---83620835076.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/4ecd5eef511490df9805856ff4207a97/vutujijuloteluvofuz.pdf
    • http://adance0112.com/upfile/editor/file/diwelovapotixiruradema.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5e1f637833146c2e892010b5d4fcc880/melorabenatoxopono.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://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_off000128b9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x128B9 16792 bytes
font_01_sfnt_off000140cb.bin
1d6c7cfc421e8fe998b871044f051957f10dacc62956aceb965a21f25e43edb0
pdf-font-stream PDF embedded font (sfnt) at offset 0x140CB 18392 bytes
font_02_sfnt_off0001711a.bin
a46bb287119937b802f29fb30992e6390dc8fada9f3848d8bb852b7caa29f490
pdf-font-stream PDF embedded font (sfnt) at offset 0x1711A 11344 bytes