Malicious PDF — malware analysis report

Static analysis result for SHA-256 77c5db7d814fba7f…

MALICIOUS

PDF

82.8 KB Created: 2021-09-01 10:37:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6bbe3798507edb0de5c9fb3cc525e19f SHA-1: ab668cf17099143bdd2aa1ed1eed5fa47a70e242 SHA-256: 77c5db7d814fba7f811ddcfe0cd4c976bcf9073afff8e1aa2d0ac07c9dad1c14
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which host other PDF files. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate these links are likely part of a malicious infrastructure designed to distribute further content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://highendteen.com/userfiles/files/44776477835.pdf In PDF document text
    • https://aviseco.ro/userfiles/file/wunuzuzi.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/gozizol.pdfIn PDF document text
    • http://kezmosas.hu/files/file/53283637934.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/64924861108.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/nolewozitinasozenifuw.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/62941315858.pdfIn PDF document text
    • http://edumedcare.pl/upload/files/29777263577.pdfIn PDF document text
    • https://lifetides.ca/cambridge/uploads/files/xapewaxuwekipenuwagi.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/nelamiwidazetivejob.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/vuwane.pdfIn PDF document text
    • http://churchillreunion.com/clients/72216/File/kewikirejumabasi.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee0a05a2334---dadewiralirudimogijapoda.pdfIn PDF document text
    • http://mooneyes.pl/userfiles/file/lusogabujaxaf.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609155e1a6f09---malenilujuraza.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16072112725b62---vikuwakogiwemolenolimu.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/49847550464.pdfIn PDF document text
    • http://thietbianninh188.com/uploads/files/67426207348.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/72483286833.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161040ef0f0808---zogavuxagokuveropawunovu.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/28176875739.pdfIn PDF document text
    • http://juha.be/_files/file/11886962726.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/43045206277.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/numebazetaw.pdfIn PDF document text
    • http://eko-gospodarstwo.eu/files/file/dojawaxomosugazeseto.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/66508442593.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=what+part+of+the+pig+does+hog+maws+come+fromPDF 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_off0000ddcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DE 17732 bytes
SHA-256: f3783d82c80124cd3abc101db9d1721dcfc86a0389eac9fa51595b0d7483f8b5
font_02_sfnt_off000123b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B0 10996 bytes
SHA-256: 944f2747cd67c2d32b2024076d0d4a407423b938efb890c0443caf1cd0f89e37

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