Malicious PDF — malware analysis report

Static analysis result for SHA-256 9381f23cdfeeeefc…

MALICIOUS

PDF

85.3 KB Created: 2021-09-01 00:26:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0d47f04222cdc96c63ac1f07a4302ff7 SHA-1: 941098718983603c4ef7d7a9954321ee4a6ea23c SHA-256: 9381f23cdfeeeefc67fd8f58b9692cc90eef849530929aec3b86da0f957da519
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely exploits a vulnerability to execute code. The document functions as a link farm, containing numerous URLs that point to external resources, some of which are hosted on compromised CMS upload directories. The primary purpose appears to be directing users to potentially malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://cerritos.songhakbbq.com/uploads/files/raxajukadokomuvudi.pdf In PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/a9d74583a3b971768c0081e27d8fee6b/gujedirugobuzejuw.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/juruzabuwo.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b46a6b9e24d---24626125552.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/f794f16a6b3286212bf85fb085d48888/47553962815.pdfIn PDF document text
    • http://cooper1972.com/clients/b/b4/b451ebb09e7e0345645526f893d9a49e/File/66090353038.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/vebezalofopanakulu.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/borawuzolulowax.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/fn6ho5a62m59nr8cpr5q8ffn34/vabavowabopifigavegi.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbc7cf135d---zazurijapedi.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/12855319453.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/a3aa27ec642d25de67237fbb589d095b/20533048319.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/96172741373.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c641e2539d1---51608786776.pdfIn PDF document text
    • http://passionsavannah.com/clients/0/0a/0a61c075fa1d7d91f8ce2ef588f7e9ce/File/tatozon.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/75214629240.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/6lt6ovtd9asqm9ni2fdoi4hger/66198030287.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210626040408.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16072218c664b5---xuniripilosapok.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609045fcb3241---60231904599.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/19918704084.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/mirokonekuzafajoveniv.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/b21f20a47519607d13d0fd6864f2608f/45941799872.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=prayers+for+victory+in+your+marriage+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_off0000e507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE507 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1E 11200 bytes
SHA-256: d36323ba60be15d198d30cc6ab8edbb28c009c06bc12747247cf45d71c69a221
font_02_sfnt_off0001172f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1172F 18172 bytes
SHA-256: 59672a7ae7234f4de198c39086cd91946b99938fe390115698bb0ec065f413d8

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