Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7df71f08ca46a3f…

MALICIOUS

PDF

85.3 KB Created: 2021-08-10 13:21:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e87932aaaed0cfb4775d522b72626e02 SHA-1: 4f986758ba3bb815289e05567b0c6826a9f7b4a6 SHA-256: c7df71f08ca46a3f647a838dee7be4370d039d8f9e21c55d4c08a041dd0b9bbc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress uploads and other disposable hosting sites, suggesting an attempt to distribute phishing content or malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://highrise.pl/file/godemipopizarizefuvidoro.pdf In PDF document text
    • http://bmsorganica.com/userfiles/file/fevavurekapevanuwemu.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f80803bcfb2---78923338431.pdfIn PDF document text
    • http://ithaca1966.com/clients/8/85/85e9e0a76fddb83d7689cebc6ab07fae/File/6202072309.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/47034629980.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071696a6db3f---96053266902.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/faliw.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/jojilinopovulason.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/cb0b859021e2cd0d0735de9ed15b573c/puwolavalove.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161053c5771f2b---kidavupekawomaxubeja.pdfIn PDF document text
    • http://salt17.com/userfiles/files/nidogabosurebutigotosude.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/mogajepitufewifitugup.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/daxevigeluxogapurubote.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba09fba4b4---9375944003.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/98006236619.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/7d2a8f1a8609e8685e1841ba27f947f7/dorebataboxuz.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/97163056427.pdfIn PDF document text
    • http://www.serenissimaservizi.com//files/78548951518.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee5766732a---46603010087.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/sd3h7f4s086bnqob481rqdceu7/venevuwevap.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe5e487687---40232752848.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fad08e283c---risixusa.pdfIn PDF document text
    • http://absigorta.com/E/file/93083541969.pdfIn PDF document text
    • http://torgoborud.org/images/file/fadujejefagem.pdfIn PDF document text
    • http://arcadia6465.com/clients/f/fc/fcac8d81e62e7f23ed02b02243def538/File/pabon.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/96281797479.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=allowable+bending+stress+of+steel+platePDF 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_off0000e7a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB9 16672 bytes
SHA-256: 79a79721a6579ecd3da8951d44cf32d44d77b330792f0f004d128c29bcb44ac6
font_02_sfnt_off00012b13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B13 10880 bytes
SHA-256: 7376fc0736546a6d2a5b82c712340353f28ea7e2a6993d713bc813fdf44f194f

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