Malicious PDF — malware analysis report

Static analysis result for SHA-256 53dfdddc83d35701…

MALICIOUS

PDF

104.0 KB Created: 2021-07-08 11:16:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: bd0325ba146441646905c779997f5b03 SHA-1: 0ea4006a88f20a9c220c562c9f379e98c5b27023 SHA-256: 53dfdddc83d35701d05a5d46c56fc664181ebea63358ea6f9049161e6da1f886
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and the ML classifier assigned a high probability of maliciousness. The presence of multiple distinct hosts and a high number of links suggests an attempt to distribute phishing lures or malware through a network of compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://laborke.ru/uplcv?utm_term=how+to+make+a+zombie+farm+in+minecraft PDF link annotation
    • http://aceonlinementors.com/userfiles/file/39916474455.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/0f568b86cca3f028e9d44e2fa19c9323/4993302595.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/4dee4f46afbceec2229f304939f0a6c9/71346405617.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16092e416ad878---kunidud.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16081fe39e2025---55698849938.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071b6ecaf529---sanejopejepemoxamo.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a0b6c1715---97499707545.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c82475632---tijokutalujoxerajonezeli.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf286d770b9---60577266539.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/70vlih9j9aq9gps87uf1kmlfv0/69996662043.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/fjatnsb1ijpp20vtkej1ss7cv4/27210507875.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd25392bc9f---lakavuz.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160944cd157ac0---81580372083.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/70ef11e10de5c10d10bc40717cfb2ca0/fasonopa.pdfIn PDF document text
    • https://2acontractor.it/images/file/22735890291.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/c45813a0738ed9cfb8a17340b56c25a5/90827233922.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c536a63a483---67905224203.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/41037566055.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cb6039e7156---rarabozavejemapufu.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607d914290768---buwosogofetezifi.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/be087c88ded239bdc234b7004c2165a5/fojuwogerafawenudiduve.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/42751036803.pdfIn PDF document text
    • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13466 17476 bytes
SHA-256: 8a853f16b449b0dbc60b98ffe79b77a0d86432a508a79b36303fda07aa40bdbe
font_01_sfnt_off00016272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16272 10652 bytes
SHA-256: 949cc3d534bf7d83ccff4cd955d6a3ab396cec7fd5465e907752438beb18ec2d
font_02_sfnt_off00017ae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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