Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2edb1e9e987f96d…

MALICIOUS

PDF

72.2 KB Created: 2021-09-06 17:31:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ce9e95ab49ae2332335a11cf5a44bd2e SHA-1: 95d6e851553736b9946ad6047e54914147256954 SHA-256: f2edb1e9e987f96dd820243ad8c320b283f3164fd37e2831b29c3a0f5062f688
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating an attempt to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to exploit user trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://catamma.ru/uplcv?utm_term=iso+27001+e+27002+pdf PDF link annotation
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16076f54430b47---luzokazimazogexajovale.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/sk9olngr4dgjn4pj2ikfl6gdvs/wawese.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/ruripo.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa08c45e6c---sijekefasaxozigekivisala.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/31713846569.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/90248243157.pdfIn PDF document text
    • https://grafconsulting.pl/Upload/file/90151436049.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/34409490659.pdfIn PDF document text
    • https://menu2uplus.com/images/file/tetogefisuvulalipeve.pdfIn PDF document text
    • https://goldgreiner.de/userfiles/file/xipikixujiwokokono.pdfIn PDF document text
    • https://nepalonlineexam.tisaracademy.com/userfiles/files/nufevotalet.pdfIn PDF document text
    • http://erpos.sk/data/files/buwitexipekaniludoto.pdfIn PDF document text
    • https://sinhadventure.com/uploads/file/59188736940.pdfIn PDF document text
    • https://svltv.in/userfiles/files/51096051197.pdfIn PDF document text
    • https://hoongnau.com/upload/files/bewazuradalezagamamaze.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/nudazajipogojiren.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/jalezedamirukofaveso.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/9dpk9b09rpl8mkokic7fc6pru7/58411476951.pdfIn PDF document text
    • http://dentistturkey.com/image/files/10109106748.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16076851fdfc5f---58742586529.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/pinubasojuraz.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160954aa08c596---25618079912.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/85772544324.pdfIn PDF document text
    • http://fcgo.tw/uploadpic/files/69263535139.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/66864415235.pdfIn PDF document text
    • http://frigosztufi.ro/ckfinder/userfiles/files/xoletive.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_off0000ba81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA81 10184 bytes
SHA-256: 8f18cc0d7c2d72d11fddb28127e0f59147c9011ef35dd7aa08869941330b2187
font_01_sfnt_off0000d184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD184 15676 bytes
SHA-256: 4d98b4dba64a7bbf2f6eb80385f171ef9e4e17b0143f1e985ead63c93ec651b1
font_02_sfnt_off0000f981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF981 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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