Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f0497c9b3cfd52f…

MALICIOUS

PDF

86.5 KB Created: 2021-09-04 22:10:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 987c394f7540312c9790f95dcd30197f SHA-1: d784b714e36da02da6abd24aa579cc85a686fc8b SHA-256: 6f0497c9b3cfd52f048b5e37f4f7b7da012bbf3346554efeeb1bc5c61c08b9ad
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, some of which are hosted on compromised CMS platforms or appear to be part of a link farm. The presence of PDF_URI and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a strong attempt to redirect users to potentially malicious content. While no scripts were explicitly extracted, the nature of the heuristics suggests the PDF is designed to exploit users through deceptive links, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://gchs1969.com/clients/867877/File/98779671855.pdf In PDF document text
    • http://md-servicios.com/userfiles/file/66408983513.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/3631924333.pdfIn PDF document text
    • http://beateromer.com/bilder/file/bufuwafaxuforog.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/47745197721.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/biwovazefum.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/fasabavewewujivu.pdfIn PDF document text
    • https://korankertas.com/contents/files/dumap.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079b4ff7fc2d---rovusa.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210825_165738.pdfPDF link annotation
    • http://kaies.net/upfiles/file/37923666370.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608798fab65a2---dururedose.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/ca4f7848908e34c380adc041bb85dd24/11877545896.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609760841322d---27062331446.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/silobazivanuvilemukepa.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/fajogapu.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/lubasudomugazomexiponako.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/doxejamimagojopatugaji.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/cc7bed43d045ac631845a6318f59abea/gavafamajipizunuzofegigi.pdfIn PDF document text
    • https://isosklo.cz./uploads/54299270913.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/97958183878.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/96058285037.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160828b5cc4f83---17301975437.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/12891946250.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=factors+influencing+tourist+motivation+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_off0000e639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE639 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE50 11108 bytes
SHA-256: e098cefc6d89215d65296a31ee3e1d06311c4c0657c4a57b47c3006817219eb2
font_02_sfnt_off00011806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11806 19588 bytes
SHA-256: 8011b3cf282e3aac1c8ee79e7736ad6b9912dd3d2799e9a40469a6c7ba5875b4

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