Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1efcceddc05a3be…

MALICIOUS

PDF

83.0 KB Created: 2021-09-13 07:49:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f8329ec7e264ac46392b4ebc9e821e35 SHA-1: ef4b8b01802baf73672e5fd103d9a115de89a61d SHA-256: f1efcceddc05a3be2ae1e3c44187195d25bc8b0841dbccf3450dd9a90eca0021
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, indicating a likely attempt to redirect users to malicious content. The file's structure and URL patterns suggest it is part of a link farm designed to obscure the true destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://laborke.ru/uplcv?utm_term=mathematical+methods+in+the+physical+sciences+pdf PDF link annotation
    • https://hopadive.cz/ckfinder/userfiles/files/bivofafula.pdfIn PDF document text
    • https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/zulozorotusanikiwesixadot.pdfIn PDF document text
    • https://inprovitcolombia.com/ckfinder/userfiles/files/45456859657.pdfIn PDF document text
    • http://kantipursecurity.com/userfiles/file/togevuxepawamufog.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/fenabu.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/17754633569.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/e63e5bd84088769be88d2930bb498da6/50115913839.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3a40db315---43038665959.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613765c97ae4f---36041767994.pdfIn PDF document text
    • https://eniedu.com/data/file/20210909042645.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/zovujoxuvigimal.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137698518515---gasiwofutepox.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/kikejadoritosef.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/77559181452.pdfIn PDF document text
    • http://malovanesklomh.cz/images/file/80483202127.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/c8485a99c3bd2c5990a905d843143c9b/lokan.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/fopebonapafi.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b74f566881---topapel.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/ifakexatirires.pdfIn PDF document text
    • https://holcom-solar.com/webroot/img/files/30928446434.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/dagoruwasizig.pdfIn PDF document text
    • http://xn--b1adrijbbb.xn--p1ai/upload_picture/58398087763.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/c83e01ec7f5795fbf882a8f57dad888b/50084024797.pdfIn PDF document text
    • https://f2h63c2.ip4secure.net/upload/files/13086082021.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_off0000df25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF737 17468 bytes
SHA-256: 86dc3a09db8f82403d9120f0afef29957813a381a46b559f4a2d317430973774
font_02_sfnt_off000124b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B9 10892 bytes
SHA-256: d672a73e0cbe9aca3f4e40ac9e111e5b75c0d272c46527018e383d1c7f08a3a1

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