Malicious PDF — malware analysis report

Static analysis result for SHA-256 88b87090ef397269…

MALICIOUS

PDF

145.7 KB Created: 2021-10-08 15:59:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: dd4f9e70433856178d0ce82781692c47 SHA-1: c24f060f78b307be0bb98de79bfbd36f9100d086 SHA-256: 88b87090ef397269b5fc7b1820eafa7d138160d958ed7d6a2fb372ed2b7b7af1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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://huntic.ru/uplcv?utm_term=protestant+reformation+simple+definition PDF link annotation
    • http://worldplastsolution.com/ckfinder/userfiles/files/ziladetiwile.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/98347944704.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/58143782830.pdfIn PDF document text
    • http://saconsultancy.com/userfiles/file/vegowaxigepawil.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1614ea9414e1db---lugela.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16141ac038bd03---64721837290.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/kufavewabasabijimifaw.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/wevevirabujaz.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161404d727584a---78025658405.pdfIn PDF document text
    • http://sandiego.songhakbbq.com/uploads/files/kabulefokonawu.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/fulimakukigebuwelezale.pdfIn PDF document text
    • https://ms02bet.net/contents/files/91884842357.pdfIn PDF document text
    • http://gaudi.tw/upload/files/kuzonuribiv.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133cf74b99f1---24558164331.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/nuvixovutodixaganukaxof.pdfIn PDF document text
    • http://artdental.hu/editor_up/90968865803.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/15490194653.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/63157063023.pdfIn PDF document text
    • http://vdavloeren.be/userfiles/files/vekemiguwomolib.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/81d520f56feef9261a5c3d9306d0a93c/petuwop.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/71195780734.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/dulenulepakedusiv.pdfIn PDF document text
    • http://numere-mopede.ro/mm/file/legiruda.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/kololokojariwenito.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/161319c9bec5ef---90299307405.pdfIn PDF document text
    • http://lamardaegu.com/upfile/user/file/sekinifiragusixuselati.pdfIn PDF document text
    • 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_off0001cee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CEE5 10660 bytes
SHA-256: 8e4f59cdb4796f20f0fff8b46bc6d1d59eaad745de1c1c3fe7b9432a0d44a20b
font_01_sfnt_off0001e749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E749 22476 bytes
SHA-256: 18d5f8b06da277205ab1e26b799257b3e0e72e969530af8ee155ecd9b911e77d
font_02_sfnt_off00022020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22020 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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