Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbc024264526ac96…

MALICIOUS

PDF

88.0 KB Created: 2021-09-06 23:38:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 887b2594a816b4d7c70ea873880b0f07 SHA-1: 2335dcaf2af73d31c39bdfae0816b9e061e37faa SHA-256: cbc024264526ac96c553cb92ee64cf837023f67b086bc10481f2740c966c353e
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 high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and potentially disposable hosting, disguised with a search-term redirector. The primary goal appears to be SEO poisoning, luring victims with search terms like 'mahabharata pdf in urdu' to ultimately lead them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/8v4pfjlomchn85f4ef17enb18i/67409891239.pdf In PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be4d1fb4f54---25876208693.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/88525677870.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b26f9412429---tamawoduveravomo.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/6560936111.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f3c2a3351---80410445798.pdfIn PDF document text
    • http://novichiha.ru/pic/file/wudek.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099b81b1fb43---45703008285.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/13594614609.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/6csqh138v3tgeqp94qj6j1f5vg/45871908956.pdfIn PDF document text
    • http://greenld.com/userfiles/8046208619.pdfIn PDF document text
    • http://indecomavo.pl/inc/67938744302.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/6941dcd6bf64fdc7a848a6c955aee789/ramijepawonitanexibeg.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607291679fda1---1377546212.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/tubowigujudipesut.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/35564699616.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/xagaroj.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1644432547---74509841461.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/bce485dbb281f53b03faf3081dfe7f52/pileguxiwivibibutuwota.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160dafadaf0638---wupofanugeravebatumom.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/vurujagelofi.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/sudakerevovafefo.pdfIn PDF document text
    • http://topstec.com/d/files/zutivib.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/bebovuxawov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=mahabharata+pdf+in+urduPDF link annotation
    • 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_off0000eb17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001032e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032E 10364 bytes
SHA-256: 159c491c4f7be7e2c2e2ff11b1f29a30ad037f603b658090fa3e09291c041d9b
font_02_sfnt_off00011a33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A33 21724 bytes
SHA-256: c61f270b10e1a1e238cc21b02f233cf63e50839232ba805a5c21acbbfc3abcec