Malicious PDF — malware analysis report

Static analysis result for SHA-256 f33b626d308c2657…

MALICIOUS

PDF

86.4 KB Created: 2021-09-06 00:50:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a7ef3da59977b8d26c1cab30c0d5dd84 SHA-1: 3a87dbe8d420b5275451baa6e286900c5758e6fe SHA-256: f33b626d308c2657767cb5b8c5085d891aada88414caf48b641dd142ecafd377
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, characteristic of SEO poisoning and link farm tactics. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware distribution sites. No scripts were extracted, but the structure and URL patterns suggest a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://pc-driver.ru/userfiles/files/28094700045.pdf In PDF document text
    • http://sfera-vlad.ru/img/file/79613795426.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/98676742476.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-8-14/20210814083308534031.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/rowuwabunapezotod.pdfIn PDF document text
    • http://inphilong.com/upload/files/zazutufinor.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/66749502807.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0451c9646f---71722801583.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/12615517.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/timesogigigofutize.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/48972183471.pdfIn PDF document text
    • http://huron81reunion.com/clients/f/fe/feec28e48c841af8be4ad6373737a022/File/4692365654.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/ab8350dd8e9e2b6b5017ee9371cebbc4/449296597.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8eb8b95ca---dezuxuko.pdfIn PDF document text
    • https://olterus.org/contents//files/gupasabawi.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/42499156805.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16088079f1c734---dubetoko.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/tosozivamigavekoragodu.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160846c862b10e---49397333388.pdfIn PDF document text
    • https://dadrarad.ro/userfiles/file/dijizubesefuna.pdfIn PDF document text
    • http://forumcutuca.com/ckfinder/userfiles/files/72867452282.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/garopupuzo.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb5d2c990c---2584877566.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=microcontroller+8051+instruction+set+pdfPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A6 11060 bytes
SHA-256: 70f6d6459fb89ec491727b2b65dba6f1a196c957c813c6d78a7e304d844fd5be
font_02_sfnt_off00011c9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9B 17972 bytes
SHA-256: c585dc4199a409f84eaff7d996bfa1d0bc16f8db37bc9fe566423d475eb37fa5

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