Malicious PDF — malware analysis report

Static analysis result for SHA-256 99ec95e3481da353…

MALICIOUS

PDF

94.9 KB Created: 2021-09-03 08:16:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6ce49506ee467d71d7b41eee1362f76b SHA-1: 0871525b970687bdf03674d592912f58dd1c1db7 SHA-256: 99ec95e3481da353082d67bd3456bab8abea935061e496e63860b7c908531825
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to potentially compromised websites and disposable hosting, indicative of a link farm designed for SEO poisoning or phishing. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it may exploit PDF vulnerabilities or lead to further malicious content, potentially involving JavaScript execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 http://seghers.kr/data/editor/file/567942681610c93974d308.pdf In PDF document text
    • http://cafemsoffice.com/userfiles/files/73571221139.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/bubase.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160732284b6af7---25339034884.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102f68c512e7---45058096456.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210605025711144.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa07697348---tuzisekasuduluwejenitu.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/xoputapinus.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/97582993664.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fde9a7bc23---96366746467.pdfIn PDF document text
    • http://talleresjpg.es/img/file/woniwo.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/zefilugezusajinoveru.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/830040896.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105184649836---jurive.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/e18b2d60bdad6685ac27706d22300b86/panekubozezirapazeba.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/161113a9e49217---folugezivenedu.pdfIn PDF document text
    • http://kisito.com/userfiles/file/rixubebonebutedabuloteb.pdfIn PDF document text
    • http://tugrabilgisayar.net/resimler/files/92279299126.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/dofuwekevokoti.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/kufuwumofarakigulexas.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/18250645084.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/dunut.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/b302915b46031ec08db7333ff776fc43/gulawufimisenifaxiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=arquitectura+de+computadoras+tanenbaum+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_off00010591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10591 11100 bytes
SHA-256: 093e70f3bb38648c220ce36bd9a2491b5264b48ed31a39287ad7aae6a37162ea
font_01_sfnt_off00011f06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F06 21360 bytes
SHA-256: aaffdb44b5f5aae0b787119fd823e497a7145689a02ec4d0a7aad067fa47c92e
font_02_sfnt_off0001559d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1559D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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