Malicious PDF — malware analysis report

Static analysis result for SHA-256 975f358d608c3f2f…

MALICIOUS

PDF

86.4 KB Created: 2021-09-06 10:12:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 49cbc36e4c0135b9dffc86486f14bd21 SHA-1: de1bd21426400bb3343c27b29ff7f3fb9532c4c0 SHA-256: 975f358d608c3f2fc2fdda04c5c19d7adb2c694cb0cd3307199bf4aba568d77a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution lure.

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://philabc.ru/uplcv?utm_term=carina+ventilator+user+manual PDF link annotation
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/9914e4b25e28eccc9ddc512c1db38cdc/83034452985.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/rakipinirupub.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610afc4ef33b1---65843108925.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160cd386d5e1e1---24542151332.pdfIn PDF document text
    • http://unityproductions.com/upload/files/tavavikifovunavoliwiguzer.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/31285378307.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/93862013674.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/7us7huqar72pcmqke3nal5bme5/48930765279.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/ac713edfb8f1009eb48d5f96b90cc9dd/34374389199.pdfIn PDF document text
    • https://apizf.org/public/file/25439770200.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a83247c8c3d---78338819101.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/nidosena.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/68783165428.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/521b14b38e64d3caffc52057a00751c2/fuwerosudunidaxufutufek.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/ketibofufemitozabaz.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160800695bc0a3---dorobojogubafaxepokunowab.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/54d86dbb9ceb70408f98b6cc6d834e7c/46437820321.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/ziwajesuxozuj.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/fajasodezijilubaxukexeb.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/joxog.pdfIn PDF document text
    • http://boeschfamilytravels.com/clients/43210/File/89479966759.pdfIn PDF document text
    • http://northstarbaptisttyler.com/clients/a/a4/a4b4c2e389351fb2dee96c3f727c6a57/File/90958829842.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/60244902943.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9d937e510---temep.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/darovom.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_off0000ecbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBD 18368 bytes
SHA-256: e981357e9560be7d9f612e5cd1e9eb050f174ce627911b36992827e667ae1cc0
font_01_sfnt_off00011bb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB2 10464 bytes
SHA-256: 9b8075ed65ffd020d140b028f73eb7d28c0d7d0df4cc331840cbe7bbf90f3cb9
font_02_sfnt_off00013379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13379 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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