Malicious PDF — malware analysis report

Static analysis result for SHA-256 de6018702ab09302…

MALICIOUS

PDF

82.2 KB Created: 2021-09-02 18:32:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d2eb2447c40b2ccc7fe134d067757647 SHA-1: b2217ff8cacd03e84f5c3cda64461ba895dadd3f SHA-256: de6018702ab09302fd90e8164180b98b3e02387e3532f9d17b712abfa0fd0508
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV. It contains numerous links, many pointing to unknown PDFs hosted on domains that appear to be compromised CMS uploads or disposable hosting. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm strategy, likely for SEO manipulation or to distribute further malicious content. The ML_NYX_PDF_MALICIOUS score of 0.995503 strongly suggests malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://heritagecambodiatravel.com/userfiles/file/ruzelo.pdf In PDF document text
    • https://atphp.ch/userfiles/file/gipofixu.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/70474326584.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/83467627661.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ae3d584b0f---89264470309.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/45778010163.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f707ad9db1---sakolosalavogowawep.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/d832804568ec4a5c1bc9e4ad24604670/berafupi.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afce4d110e3---gewopunebidogamuvejuf.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/82392772810.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/37662979381.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/qjhfague71gmcr9lduds19sj37/nefate.pdfIn PDF document text
    • http://ca1970.com/clients/10044/File/zibipetulalobif.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/30223547202.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/22323783717.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/saxuburajarugujada.pdfIn PDF document text
    • http://plastikacz.cz/soubory/files/84599339360.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16080d90318046---25845318043.pdfIn PDF document text
    • http://lighthouse-connection.at/myPix/file/14694464222.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/r4j0orv359qn9uu1jg9j2mfkfd/84502372574.pdfIn PDF document text
    • http://roweryelectra.eu/app/webroot/uploads/file/16215160789936.pdfIn PDF document text
    • https://derfo.info/resimler/files/2263023004.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16086bc7e1fad8---kewenixunefebewifike.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/mefulubu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=chicago+manual+of+style+citing+a+bookPDF 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_off0000da41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA41 11160 bytes
SHA-256: 3ba986be60e053f0793fc57384764a353d294a8418a797cf582f26ef2b05f1e4
font_01_sfnt_off0000f447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF447 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C59 18544 bytes
SHA-256: f3b98344a5d5ae4220e03c7c07b3b64e82bacf8e41a11f81b1b3d1d49f1bde97

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