Malicious PDF — malware analysis report

Static analysis result for SHA-256 7491e54962d7d4d7…

MALICIOUS

PDF

75.1 KB Created: 2021-09-03 04:47:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b810846697ae9e171ca2fd5dff4f4032 SHA-1: 54f6ccde0af70567eaa0b90daf643377aa0d1a09 SHA-256: 7491e54962d7d4d7bf920a95ac45f2a38442ca62e427e18f1af96a19d80476e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a phishing or trojan distribution attempt. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other potentially malicious content. The primary goal appears to be redirecting users to external sites, likely for phishing or malware delivery.

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://inwebjor.ru/uplcv?utm_term=free+printable+color+word+worksheets+for+kindergarten PDF link annotation
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094142a5a090---rivaded.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/71dbaa07ce49c6267fd7c103c9166e9e/87534348160.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/kodefukovaditex.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/xofuluwosuxorelimidubofis.pdfIn PDF document text
    • https://pavimenti.pl/web/uploads/files/78485206325.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/daleluwi.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/63860883087.pdfIn PDF document text
    • https://upaspor.com/resimler/files/bawof.pdfIn PDF document text
    • http://89928386.com/uploads/files/202108250046283204.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/4bc3770ff55de956bc3bfafc0a8a476e/94293923600.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2028d82d4---babosoz.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/reqart9nvhils0ui4qnoinkqaf/zokonozarofanuvom.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/29033921194.pdfIn PDF document text
    • https://istanajp.com/contents//files/2375835663.pdfIn PDF document text
    • https://upaspor.com/resimler/files/32069261452.pdfIn PDF document text
    • https://qkon.ca/images/file/37925647953.pdfIn PDF document text
    • http://araonline.hu/uploads/file/sasatovovisugoji.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/89804181546.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/0ojgblgr7qd140ao57sctn9rdr/59664968928.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/silakiwi.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/vudisuf.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/18506975705.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/10621026062.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bcca4dce3ca---91381729008.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/ponasipufafili.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_off0000bf5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF5D 11192 bytes
SHA-256: 7859550204d011fe205a808d2b0bc3d48e6ae74604ebc40b0ef13da76eed43db
font_01_sfnt_off0000d91a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91A 16748 bytes
SHA-256: 22c7b9c5cecd8fdd5e2e96aefbd2f215e2b7a32c068742c090e48abcedc8d4f1
font_02_sfnt_off00010491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10491 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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