Malicious PDF — malware analysis report

Static analysis result for SHA-256 665ba11714c8da61…

MALICIOUS

PDF

79.2 KB Created: 2021-09-02 05:26:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: cc31535d876d383b67734964a78c7d99 SHA-1: dab81d0a03b3a6908201f4b4ece081640e8c94c7 SHA-256: 665ba11714c8da61e430c1e39f72936d49eb56bad041416f329aaeb1dc5d541c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with numerous external URIs pointing to potentially compromised websites or disposable hosting. The primary attack pattern involves luring users to these external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://queure.ru/uplcv?utm_term=algebraic+expression+to+verbal+phrase PDF link annotation
    • http://eminenceinc.com/userfiles/file/wufupopofavero.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b39265d29a---7163944888.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/68fa4df57d6a980af89e8c922d8c1d0b/73540907876.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/53180754732.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/84197751497.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/pododa.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/28851812471.pdfIn PDF document text
    • http://goldia.cz/data/file/lopagefatabejirajuwaz.pdfIn PDF document text
    • http://rotarylaspalmas.org/documentos/file/jifasamelisedofag.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/8036293819.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/c7acd90ed2940e49752e59109045315e/wovipi.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/95178601707.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a919b28f9d0---xodapokatipabe.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/i59kumaltsq5792l918m8a2c95/fidosipuvaxifum.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/71579704181.pdfIn PDF document text
    • http://quetthe.com/upload/files/tutanosavivenipanuruso.pdfIn PDF document text
    • http://beateromer.com/bilder/file/benezawejidezavalinez.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/mavumu.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/5e433312f9ad6431739a380f5d1e0df6/bunetedenirakev.pdfIn PDF document text
    • http://hintzfamilyreunion.com/clients/1/12/12a2788c5de59b93c87e4eff35998d4f/File/49931941785.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c116c848879---61284480592.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1608691a633624---tikidugiguraxuxuropusadep.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb858d5036---46202233581.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_off0000cd85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD85 18480 bytes
SHA-256: 64a6a95551045c25df0e5b575f7f91530060d40c8beebd6306e06764fee64196
font_01_sfnt_off0000fd94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AB 10940 bytes
SHA-256: 2c2b97b6f9aa0e288140e543a7d863a947ee3e6b79f05dca8e7441e6ac533025

Open this report in the interactive analyzer, or submit your own file for analysis.