Malicious PDF — malware analysis report

Static analysis result for SHA-256 b24bc7cc6483c873…

MALICIOUS

PDF

81.3 KB Created: 2021-07-14 03:53:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7d0441847ffb15ce4cdeb9ffc3571957 SHA-1: b0c806ee49e4d3be88dadb5cfadcfd323b9b9cca SHA-256: b24bc7cc6483c873b9bc9e067158415a8fbf1d6d3d26732f8b9702ad1dd3b377
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous links to external websites, many hosted on compromised CMS platforms or disposable hosting, suggesting it functions as a link farm to distribute phishing or malware. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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 https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/f9c55c12c01d22094cdec7d222d02fc8/worevok.pdf In PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/72039804310.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b684dc3374---88535343714.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/sixodataxewoxebun.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/f6ad649e130b9f82738ffc43ecaf802a/tukofigexilibap.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/7d791fdb54b4fa7c810e2f495653deb5/41031683974.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/e8bc3a67e948ff79f06f25a4fd8eb2af/kemuxagamogadakuwilujeto.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebf2c7bb38---16490734698.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/c89147f2946e44e4b722b62afd9197d3/sewopujowesopabedumetux.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/1dht983ujouvl0lu0ul15ud6i7/kutatekesus.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/7kdpemip6kcbk1lj121njdfbk3/dezamapozil.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/tijozozefuribapuwidevuzul.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2e098d762---vafewow.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/58ue790m2hrkkrve1jo10dfdtv/22583002205.pdfIn PDF document text
    • https://botorka.ro/userfiles/file/rudidobaduvudogojez.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f4b2295f3---9636230300.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/fidelogobiwigosuzuxezikiz.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/muzegegifejibeta.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cccf9edd0d6---tobiwoniwinojajogizide.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/82426441064.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1db962f64---jurodadovomemikaged.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/82721014944.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/filowivijenimiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=find+the+smallest+square+number+which+is+divisible+by+4+9+10PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC166 16988 bytes
SHA-256: 2dbd552d401de6dff6bee9746077fde21cd6c071e53f5e45b361bd10ebc70dfd
font_01_sfnt_off0000eddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F2 11564 bytes
SHA-256: 0f9bca8bd79701e3dbba1dedf0b032f450c9ba01b6e0c4a2abc3f1614235ad0d
font_03_sfnt_off00012114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12114 16344 bytes
SHA-256: 5cd8a120e106fc2d4fc1855603a636a3ce922decfb1b4d98f17a4a5450337c58

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