Malicious PDF — malware analysis report

Static analysis result for SHA-256 2133dd4e842da6b2…

MALICIOUS

PDF

81.2 KB Created: 2021-06-30 13:02:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: eb2bb0ead0cec9c2d4b4e6727c6d62c5 SHA-1: 861e010f7f223ad2475438c978c3c25ac3741074 SHA-256: 2133dd4e842da6b2ece7228eb5ad8d40a0bf88279075b02aafcce291ee5fe12e
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://unosms.us/userfiles/file/7341255708.pdf In PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c864181e80---kogij.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/id5nrlovqcg09bkfo44vl9ifk0/rubepuboguse.pdfIn PDF document text
    • http://macphersonproperties.com/clients/876251/File/85970828325.pdfIn PDF document text
    • http://446888.top/userfiles/file/nivudavibekezi.pdfIn PDF document text
    • https://groupunsur1.com/contents//files/vejorobowo.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/cf0a302edb93bfdf9306e09a07f00f8d/sizimujozukevodasafa.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/48128579786.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/wemewewuputukax.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/0344286af5775ade8c148350dae15ee4/papixifotuvaxovisuwora.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/zavuxorusedikiw.pdfIn PDF document text
    • http://twothirdsmajority.us/clients/38522/File/bujuro.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/89843864816.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083236cc5dee---14524093756.pdfIn PDF document text
    • http://briarcliff70.com/clients/874901/File/3857806470.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808cc439932---sarigobazomup.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/72982144555.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/vifim.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2f6a43bc7---59729791021.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/34506784287.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b28985c9466---82418896976.pdfIn PDF document text
    • https://mimpishio1bet.net/contents//files/fazitapesagajuvesozo.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/4809688849cb507805b52f372cc69e7c/mupumef.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/557692977.pdfIn PDF document text
    • http://bogieclassof67.com/clients/71235/File/vikizatamunede.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=search+in+pdf+onlinePDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/4f0df5634b33db71a7f97c17b5e74b34/vodetasogetuwevipereb.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_off0000dc9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9C 16580 bytes
SHA-256: a8bad7a7d137d734eab7d4c944e5f63cba714916e2c514a88631125343581494
font_01_sfnt_off000107aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC1 10524 bytes
SHA-256: ddc05a737e7b7b45166fd51997217cf5b4fb236dce659c7c9bf4034a3c895bd2

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