Malicious PDF — malware analysis report

Static analysis result for SHA-256 202921d1e19fa499…

MALICIOUS

PDF

86.3 KB Created: 2021-09-04 07:00:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2ede7c87ae4cf24e037b028c5663c3b4 SHA-1: b33f58d4ec845e6dbb931a916573db8ea76e788c SHA-256: 202921d1e19fa499afadbd078f4b61a1081a8f4e14acae850f7baf852befb289
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The file also exhibits characteristics of a link farm, directing users to multiple external URLs, some of which are hosted on compromised WordPress sites. These factors, combined with ClamAV detection and ML flagging, strongly indicate a malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ailani.org/wp-content/plugins/super-forms/uploads/php/files/15a5ed2775d00c3946af7d15a8cc1d96/soluzumige.pdf In PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160aed87247439---jadisamosarizew.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/bcc8640b85def2488b0c44eb4530075a/japikeneruki.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/lulivubuwowatususafi.pdfIn PDF document text
    • http://runwellconsulting.eu/file/file/gazoligaxo.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/35825499175.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/93067579013.pdfIn PDF document text
    • http://qhs1978.com/clients/d/dd/dd8db5a278a7ad55a2ada34b8e38ebcc/File/34838662833.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131ab8161ce7---sumosotisofuzok.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/jqf4vujhu1cb6h6rb5rj91vl48/11420910184.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1608187034cc29---pezixalukulojij.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/6358127820.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/36216647093.pdfIn PDF document text
    • http://stylekd.ru/files/10993964150.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608943e5ea93c---29539485745.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609841af8668a---josuvelafif.pdfIn PDF document text
    • http://daivupaint.com/img-chamthi/files/53112915608.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607712f45033c---fimolusuduxodomikefa.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/98858014050.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/riparuzekolupidojogoz.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f77d0a6a3a---57309818911.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/60297090850.pdfIn PDF document text
    • http://uticahighclassof78.com/clients/8/89/89c70e22fe5ad1405280b455f64975d7/File/48554687610.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2e098d762---vafewow.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/66759265356.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=earthquake+resistant+structures+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_off0000ed42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED42 17444 bytes
SHA-256: 490f0d267829df5aea11919fd5a52a382a39565ac37f5dbd56e19bbac7b4a0a0
font_01_sfnt_off00011a06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A06 10872 bytes
SHA-256: e4e9141bf4cc47538c6a369befcc311b0d173fc67040688d8b5e1f3e6864a2d5
font_02_sfnt_off000132e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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