Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3cd39ba47313b56…

MALICIOUS

PDF

82.6 KB Created: 2021-09-07 20:46:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: d94404cccb0cca54cdcc2689ed4852e1 SHA-1: c5773095a231d25dcdd3c8f18d5d0f7ca0c15beb SHA-256: c3cd39ba47313b5604c33496ee3805521e3b407aaadefea418c77579fa1a6c93
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised or disposable hosting sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly suggests the document's purpose is to manipulate search engine results or host malicious content, rather than providing legitimate information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://studiosaletta.it/userfiles/files/gugovofika.pdf In PDF document text
    • https://papiratisk.cz/soubory/suzudorunulefubekoro.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/legexadosejopabimosen.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/nedaz.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/t7sascldfm9rt458imuaoceml2/61605342044.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1a41874d7---nowoli.pdfIn PDF document text
    • http://dichvuwebsites.com/media/ftp/file/biguxewizogofobenoxubu.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/duzufoxav.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16108694d32cbb---texeviwagobawivuz.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc50b452107---zepiderutuso.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7c10b951d---77309966703.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/750c6c943cd3ef65355eaab036af53e5/41227691390.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/7c1ac611f88e26eb56dbc0459f2370cd/viretufonizukerol.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/rofakofadodur.pdfIn PDF document text
    • http://debschoen.com/userfiles/file/gewevukegi.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/damulajebatixu.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a49eafbff6d---38454008736.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebcc5991d6---vigapufuwigubife.pdfIn PDF document text
    • http://amdind.com/userfiles/file/60616113377.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf99d0230c1---milidifaxedepilubife.pdfIn PDF document text
    • https://ovth.ch/userfiles/files/vonukakikupusij.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984a8442849---nejimaloxegozujirike.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/nuripokalud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=spirit+fitness+xbr55+manualPDF 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_off0000ddaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C1 18052 bytes
SHA-256: cab94c0dd872c3a971254b7f588f1c5930bb2dafe6bf1a8171ace4da44ac1613
font_02_sfnt_off00012415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12415 10952 bytes
SHA-256: b35c721c0154bcf8af73509e17e628090f5360bac70f418d7dfffa3937f571fd

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