Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7ce79c3ea799f16…

MALICIOUS

PDF

86.0 KB Created: 2021-07-04 13:01:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9bba2c3be95b2427f2b979a3af5517f8 SHA-1: 159e6e87880be5b6a86d39501ae275d413ef97a2 SHA-256: c7ce79c3ea799f16964e30db4fcbb86578a39ebf5b8a2a2fa60790f6374b3362
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous embedded URLs that point to compromised websites, likely intended to lure users into downloading further malware or submitting sensitive information. The presence of multiple external URIs and link farm heuristics strongly suggests a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://crysiq.ru/uplcv?utm_term=legal+relationship+examples PDF link annotation
    • https://aronabritcan.com/userfiles/file/wawurokekixefubomivososo.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/473a6d31646c8e6d097710c11b7028bd/81932901158.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/60d4fd73c9a9ff2813f0569b9ad72a57/3798362658.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/2ae99023d0ff533f1f8b5239c6701512/deroledukor.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/1a0k8afmkcgn995m7mcqa1ol62/zibewuwup.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/75853461394.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/imntpt9buv7q9kgd5d21ce5ams/ximoxajasalenibefuf.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/636f4099859f42e617dae247ac820814/wefopakes.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/88591124196.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/17a1dc3bcb862aaa9a700d82defb1990/39536615671.pdfIn PDF document text
    • http://itfind.ru/uploads/file/bewavemak.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/26977584342.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/40486160282.pdfIn PDF document text
    • http://htwy.com/upload/file/javaluwamufu.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a82bdc76545---72797884848.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/f7c25cd0c2d6884c0ede18aeed57a8f5/poxixegatu.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/molobemojuwavaxatuzopote.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a950ac0c1---mozivawakowujokovowamimi.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/rebakobugikifeseruxaneb.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/rc0jf12n5vndbu9ntcpc1sndas/fijetakiwurokapupirebera.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160888a03424af---61255381729.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/43863389478.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/nlek1ij067g3vmd4m0p87snbi4/81872449418.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7c0780ecc---43237956590.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_off0000ee2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2F 16808 bytes
SHA-256: 0fad79c53b08fe6b17c5b976a26d48beb974b8eb04c16c4f01b12c266e6f86a3
font_01_sfnt_off00011a14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001322b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1322B 10756 bytes
SHA-256: f687cfa53ca53f0adab37db24ee80e507be42575c0e648701cb8b6d904ca9e0e

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