Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e5efc172871d3c0…

MALICIOUS

PDF

80.1 KB Created: 2021-07-05 19:54:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: dd874450cfef423d88395a2b57d578b8 SHA-1: 96492e274c132beb0cc8fc443bdf8ac748960561 SHA-256: 7e5efc172871d3c0b567bb9d78af530d0a86db07e7223579c5b2d5b5d04cd9bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a deliberate attempt to host and redirect users to potentially harmful URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://archism.ru/uplcv?utm_term=dead+or+alive+123movies PDF link annotation
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/401de96a084eb8c62e4838a5061e7dda/wigiwedegejemogudoga.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/de13c05e15d6fdba868a44d1248ae413/denenijofof.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7761b6d799---gozovud.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/74206302152.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/e48abbd6f4b7ecf516795d33b6141dcf/rofepubogukejafesak.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/bd62301753b7eea5521e1572788dfa48/87229125567.pdfIn PDF document text
    • https://scalper.ir/data/files/file/41159184854.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/ketokizixapokib.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bda66f15e13---79045762016.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/kukata.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/nusakufefoji.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773c2694d78---13559467636.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/wagik.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/23532543529.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/85268473165.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cb7fe6dc7d0---68067657045.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/d21ffb4b3644066c1d0a42d36d5401dd/90249633120.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/rapavugenexoditijaga.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/58dc5686d3e1ac425358687bd967e616/76390841436.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608265e306807---bopegizodatanutixezas.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_off0000d357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD357 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6E 10620 bytes
SHA-256: e5e97440da446267a7f0e20395bcd62f8adefeba8cd36418456cb7068d745114
font_02_sfnt_off000103c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C8 18176 bytes
SHA-256: 749f8dbf90ed9d3eef55787d8507f867b61c8218f656e1ae43c0499954840bd7

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