Malicious PDF — malware analysis report

Static analysis result for SHA-256 19547ad50f4a295f…

MALICIOUS

PDF

70.6 KB Created: 2021-06-18 19:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: c090fce674430dc429200185a777b3d9 SHA-1: 3e628c23ce6b752d22faddef5750b460404cd12a SHA-256: 19547ad50f4a295ffb8799c08be23a0ec720af5a5a0f8eb706ec9a15d6d6e8b2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9557

Heuristics 5

  • 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
  • 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=love+sad+images+telugu PDF link annotation
    • http://yearbookplus.com/uploads/ckfinder/files/12551686574.pdfIn PDF document text
    • http://azizolace.cz/images/file/lexerum.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607914d68fbb2---14440289178.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/ed73c1ea500c531311f44f1737ac8a29/pogujasobosusokagafataka.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/4a0f7fdc9616814a7ad9122ee5738145/84637782499.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac41f70586f---jukubipize.pdfIn PDF document text
    • https://marosme.ro/hirek/file/4011796708.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5433cde58---sezotepobajimukekulof.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/45958501507.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd1941cac12---mivefezoduxibimar.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/josusogavujugi.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/piped.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/b1678e76fb7b9eb7f0014dca3847bb06/vaxapijopovumajober.pdfIn PDF document text
    • https://armandofalconi.net/userfiles/file/rutatoxorekit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC42 5048 bytes
SHA-256: d6fa4a06ec09d9bd5679a4e25713ef4bebfea5f04e2a79fade910d42f9a09678
font_01_sfnt_off0000ed66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED66 6128 bytes
SHA-256: f55282f7e3b94901c49f135f213d192597292c09f5becd9343c50df05b193925
font_02_sfnt_off0001017c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017C 1864 bytes
SHA-256: 4de31c7a75fefbdd3368d96489f923eb8ad0539259d850d182381253bb99f8cb

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