Malicious PDF — malware analysis report

Static analysis result for SHA-256 32ec102452dca33d…

MALICIOUS

PDF

77.7 KB Created: 2021-09-17 09:31:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 38d9898c135cdc47a3e01da40a74d24c SHA-1: eee764ade47cc9fc15bc22fbb1bf5108e1bb1c5e SHA-256: 32ec102452dca33d40ef0bfff5f6f9cccd90d59251ed86bd240b4be132c3c776
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains heuristics indicating it is a link farm and hosts a fake CAPTCHA, designed to deceive users into downloading further content. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the presence of numerous URLs, including one pointing to a compromised WordPress upload, indicates a likely attempt to deliver a second-stage payload, possibly involving JavaScript execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://intekcanada.com/ckfinder/userfiles/files/gasogisokakofizogugofa.pdf In PDF document text
    • https://tinnituskozpont.hu/files/86130825633.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/10325883200.pdfIn PDF document text
    • http://prepearl.com/uploadsfile/28414101717.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/gabodulizikanujafatafijez.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/911bd464f67f2b420339395eab642048/tusutuxadupafafabirafej.pdfIn PDF document text
    • https://quangcaowebsite.xemlaco.com/uploads/files/tibafepekemaja.pdfIn PDF document text
    • https://bunexim.dascalita.ro/app/webroot/files/userfiles/files/wugiz.pdfIn PDF document text
    • http://osingenieria.com/images/admin/file/30606132922.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/nikisu.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/161421f7218a3c---xepaxiwalu.pdfIn PDF document text
    • https://harmony.im/userfiles/file/lijujakonikeba.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/0f0a80a467d5e0e659ff9fcfe85c9eac/43546627142.pdfIn PDF document text
    • https://gppacdatabase.net/userfiles/file/sojojifibor.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/36484177668.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0d49408ae---33928437811.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/356981845.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/5071829705.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021090701494494411.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/ninifuzatuwuguvu.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/31032078828.pdfIn PDF document text
    • http://kindergartenhelden.at/upload/file/9511718184.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/27170260697.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/gowuze.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/6b45d25b1eb2790c9c6a19afb6eb78e9/momizewixis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=marvel+spider+man+apk+download+for+androidPDF 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_off0000c8a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A5 10800 bytes
SHA-256: 9c7fccaf7bc9428cfc9720e9eee1c46e3901f7ab4ee73bfa125acf93e98d1911
font_01_sfnt_off0000e188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE188 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99A 18296 bytes
SHA-256: 32a8673576468d007108134c05bffe2b1d38af9f6ab06a28b53ab81a5d6d9a31

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