Malicious PDF — malware analysis report

Static analysis result for SHA-256 572a79e15af3ba63…

MALICIOUS

PDF

84.8 KB Created: 2021-08-17 19:45:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8b396226d8e79a654600218ae77fbaf5 SHA-1: 1ebc4521781cf22fd72dd4f7d889af7eb377d574 SHA-256: 572a79e15af3ba6374a7484b23e827ed2716d21fb87a3f8bf9bf107e19e77a14
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URIs and link farm patterns, suggesting an attempt to redirect users to compromised websites. The document body is heavily obfuscated and unreadable, but the presence of multiple links to potentially compromised CMS uploads and disposable hosting reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://inwebjor.ru/uplcv?utm_term=onavo+protect+vpn+apk PDF link annotation
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/8a936278a87bc9a2f5711314404527cc/tuvusisolimud.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba129b9e0b2---wekozosulonuforugufik.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160bd770f2cc05---fisedewubovedamil.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/21970858635.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/f4a5e0ce52520026e0ea3148a02b3c74/22333691900.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160fe496d6160d---kogobopuviridepukaputil.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094e067111c4---xakixapumosadodojitutelut.pdfIn PDF document text
    • http://kristenpell.com/userfiles/files/tapetix.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/98gidg0b7t5mbcc7til53rpbr1/53976914771.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/59990939688.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16092d262a669f---zedanidez.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/nesasoxesozororif.pdfIn PDF document text
    • https://jotelek.hu/files/file/loguveriduwi.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/tufevuliti.pdfIn PDF document text
    • https://senhewood.com/d/files/zekaji.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086be3b6a120---27214233554.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/4037721760.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/tekivukiz.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f40a587699---15246203490.pdfIn PDF document text
    • https://botroul.be/uploads/zorogajotawafutoke.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b968d35e8c6---63636623555.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/602f5c50953e4392a4e88c7b1945eab0/pewofamun.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/7c64c16ad05a5b622c156a6b1b951ca0/52730581367.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc2091823e---43544398431.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_off0000e96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96A 17148 bytes
SHA-256: d9b8f370297ae212b7b618b7c57a6243e9297b8da14eb0f5b747654bcca1a8ce
font_01_sfnt_off00011617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11617 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E2E 10244 bytes
SHA-256: e0562a3a0fc31d9aa2ecf3f64bb72f67a70823aa17b9820b7e5f5fedc146b99a

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