Malicious PDF — malware analysis report

Static analysis result for SHA-256 217aa97ae0fc0205…

MALICIOUS

PDF

88.4 KB Created: 2021-07-16 02:30:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 46a915c356945b56c4b5a189a7613ff5 SHA-1: a57917ee7382446bf7329c9f95735c587332dbf1 SHA-256: 217aa97ae0fc0205a7021136f9698bc0c534b15715b5ea2d454e59be20e2aec1
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm or SEO poisoning attack. The primary goal appears to be directing users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • 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.
  • 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://sonntag-immobilien.lu/userfiles/files/12356046717.pdf In PDF document text
    • https://iguanapools.com.au/wp-content/plugins/super-forms/uploads/php/files/so84c2v5guhrrc9h6qqi9ci655/jidit.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/72768374159.pdfIn PDF document text
    • http://rsst77.ru/upload/files/bubuzig.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093f6f636b7e---damelojazogilanefafefam.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/pivuduwiwepal.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/sizawujutimobivusubuzariv.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16072b90975d62---8987496822.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/p5vf2k8b9m2c8s2o43i022ho9d/22276321409.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/77608036169.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/84b323d51d54f3b3a3f197d14a6e5224/zikeximuliwubuzux.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/5eeda5497d3b764096906b8eec736a94/bekulitigirinuj.pdfIn PDF document text
    • http://gwhs79.com/clients/867100/File/gefufowotijer.pdfIn PDF document text
    • http://bichvan.vn/upload/files/xiwawaner.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa6da634b3---43823664690.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/eb45a0097a8f47af9cef9d4935b8a3c1/gigenelajabudi.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/p8nhjnorbtoa2atbbltja69ic2/68981654702.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/ad30a8c0cfa9fc918043723da7cfb49f/xipuwutu.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac61ab3ca4e---56832135603.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/5042707464.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/poduxava.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=select+hotel+wiesbaden+cityPDF 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_off0000f654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF654 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E66 17576 bytes
SHA-256: a8028b501714d3782a82c92cd5685636fe50c0086db3c9d702f04b425581a979
font_02_sfnt_off00013c10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C10 10780 bytes
SHA-256: 2be134b4f58cb43c87b08752983cd0299b04fab59e47b0bafaf8d6f17481cc48

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