Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd7670b424df9eb6…

MALICIOUS

PDF

81.8 KB Created: 2021-08-15 03:11:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: aa007d13f8419a1d752475100e5403dd SHA-1: 3fb5923c5e8f24620984c47410cc1390d75cd0a7 SHA-256: bd7670b424df9eb666560d95f6edbd174e3772795b991a266d672df111a12ee1
164 Risk Score

Malware Insights

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

This PDF was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised WordPress installations. The presence of multiple links on disposable hosting and the use of UTM parameters suggest an attempt to manipulate search engine rankings or distribute malicious content through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://alyansdugunsalonu.com/userfiles/files/40078719091.pdf In PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c796a73ae6---nizuto.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/18003460232.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160d8e6b2e9fc7---defoterekuw.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/74676870206.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/97048305344.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/75154824093.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/icnvv6egjhnmqohp86e13rsl2i/rololomuwe.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d147e12ef---89506231956.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/kelatilugiv.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/13271810988.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/a1f43713b336713c09c7aa1e15ecb17a/wejalajopo.pdfIn PDF document text
    • http://nccutrackandfieldalumniandfriends.com/clients/2/2c/2cea5a7e730406ee40dfbbde6098010c/File/57289227294.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdcc6239de---46572547863.pdfIn PDF document text
    • http://slanfusa.org/clients/47225/File/12283902309.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/98735407679.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f07c6eadef0---14173741175.pdfIn PDF document text
    • http://katheran.com/clients/55933/File/70237915555.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210811_CF578861F0901C1A.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/55570505998.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+start+proform+505+cst+treadmillPDF 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_off0000d64c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64C 11008 bytes
SHA-256: a70f70936b174a9fddfeeb29f12cb76b788b65dc01a7d092234e46a4efea59fb
font_01_sfnt_off0000eff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF9 18136 bytes
SHA-256: 9b4e8bea699bd2487cc70662cd711eb4d8fa8be31da39fbc01d3c51231b3b5aa
font_02_sfnt_off00012005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12005 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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