Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5b4c1454b5affff…

MALICIOUS

PDF

92.7 KB Created: 2021-07-21 21:23:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: d25df3b6e68cc8981c1aba0c5e4e4ed2 SHA-1: 7434f1c76ffa3f593c1d7c46bf08adca43f21045 SHA-256: d5b4c1454b5affff4f7759326d2508404dbddaf774c0f12c6534a36c08f21b2b
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of numerous links, including those pointing to compromised CMS uploads and using UTM parameters, suggests an attempt to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://thrifty-uy.com/files/others/9385902575.pdf In PDF document text
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/kewixuvotavekotiwukupodiw.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160712f1f4a09e---97021797024.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/2ed68368ba0ec1db77167cf6a906802c/suziralanotepibafurekij.pdfIn PDF document text
    • http://backyardreleaf.ca/clients/6/6a/6a4eaaf8452764cb6fc14c9064ed0c71/File/gugifimilepena.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af5a5aefd48---88512423758.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/2cd0f9612f57b167497bbbd8224d20f4/zapavifud.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160709f04ed648---nefidagogubupaka.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/178c8202bf523b911a9341d8ab35c469/zadogakipu.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/wipetikakisufijuvabujexu.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/1l4q6vdkbmad6p0prj8bl1k955/12164250860.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/jotuwasekutuki.pdfIn PDF document text
    • https://etimes.mn/uploads/files/28769628694.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/ltabi1k2uo2av9as9q467o22k7/44951483806.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1608384844ce45---zotazonimi.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160883d1aa45e0---sinorivane.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/bf758ba08e16ef52869f2991ebb795e8/xekidipegug.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/a105b01bb64b7083543268bb4413f899/70711230019.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/35096929550.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/a62df7d86cce1ce39118bc43b8cb4ac1/30640506839.pdfIn PDF document text
    • https://seitonsolutions.com/ci/files/322815038.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/wowekuwujudaxililorupej.pdfIn PDF document text
    • https://synersys.fr/contenu/file/40931843687.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///daronipogitijusasi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=born+haber+cycle+for+mgclPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011ccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCF 17660 bytes
SHA-256: 1279d00362f4c16fb0a1ba5f77d0d95a488dd19a0d51a4753bbed4f96221ca2c
font_02_sfnt_off00014b8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B8F 10732 bytes
SHA-256: dee64c7cc6c1d449ffc8829bb10184b4388a9658cc0daa9a43d003438170ea3e

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