Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7443428a300c85e…

MALICIOUS

PDF

85.3 KB Created: 2021-09-06 22:00:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b29a6bf5550466223b294787734932fa SHA-1: 9364343b7190679f1dc9d9d9703f4c9660e9be82 SHA-256: e7443428a300c85eec236bce90bcac692b642484db8dfaf886b7c5757b035343
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised CMS uploads or disposable hosting. The PDF structure itself does not contain readable content, suggesting its primary purpose is to host these external links, likely leading to phishing pages or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://apsara.ru/userfiles/file/ramatexedipuri.pdf In PDF document text
    • http://sva-jeanroze.com/xmedia/file/wezepibemewodez.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/94629695306.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/65046642057.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/62805846879.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/13229026752.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/valabemiketiwizupepunik.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a9546b9a5e9---10964035588.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/37559904345.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161360870e27ad---jixutebuv.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/xilawis.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/34628431643.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/wanewakoz.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/utfh0fke1tvmpfq8p3laumd5e9/3264803449.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/voliselojujofepow.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816ea17924b---tolafekopu.pdfIn PDF document text
    • http://summithigh75.com/clients/867147/File/jeguferapivotizukonadifu.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8403908f2f---lijevanexonipudiso.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/18698531266.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/9481dd0ffc7b392d6238c138f4c0c21f/40776071013.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/dn0ftcn85q23bdomprbrhq2594/zepixukidariruludufiwufux.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/difid.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/roxiru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=benefit+segmentation+definition+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_off0000eb44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001035b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035B 10748 bytes
SHA-256: 2b94742ad595034280f0ebe87214e737724cbc58a2a05478733da6836f17ff34
font_02_sfnt_off00011be6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE6 16988 bytes
SHA-256: 0fbf15a034579f78f0575a381fafc847f68a366c8a661ee8b8450dfcf8ea675e

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