Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3199d67a88e4f5e…

MALICIOUS

PDF

89.7 KB Created: 2021-06-29 22:59:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 7f4ba4ae234fa9deff0f273d4290edd7 SHA-1: 00faa47fa433319deb0d91700ef695830d356575 SHA-256: c3199d67a88e4f5efbb9b2535df090fcbd8a087de05e2293844267d8402f3198
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites and disposable hosting, indicating it functions as a link farm. The presence of 'utm_term' parameters suggests a phishing or SEO manipulation attempt. ClamAV detection and ML classification confirm its malicious nature, likely serving as a lure for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://coretry.ru/uplcv?utm_term=what+to+do+if+your+nose+piercing+closes+on+the+inside PDF link annotation
    • http://nessium.fr/userfiles/file/34224000668.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca911606b6---59709492021.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/993c7a1b56fb38595bea39c20aaad6cf/mozoruwofojolamuwizuva.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/5a2f68254278a9a61c1dcd71db357599/58416659878.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16088ea150d9da---wapologanalag.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/5betadrmdv6clhg6niil76uj53/fikolitoruzusirorox.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/75fec59099ae00338a5b0887f05eb35a/mozugudodozitow.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607447778aa71---39421538908.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/94980226112.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/48190368765.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ba8bc6d35---xatoxasojosajevaku.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609474c6b2559---68632160904.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/nadewerib.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cnvjr52llbafgu73lv8ekk8pm0/9058412124.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a72c0183c0b---gelud.pdfIn PDF document text
    • http://mulherinscampground.com/clients/879992/File/zokusenubixuram.pdfIn PDF document text
    • https://bamor.org/userfiles/file/visofivoribupokuzivolej.pdfIn PDF document text
    • http://bwc.lt/i/milevenagiduwuzexawi.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16095b9ad0126a---64676880496.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb97f4dd2f5---wudanelizej.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a34493d6750---96352220664.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/kesegobanir.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/6c2250c38d7128c8dcf74c9621eadd46/gunutodavagevuzawugo.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_off0000f9fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FA 17772 bytes
SHA-256: a224d46f12c35b4ea9d6600a97b976778fae7eb0b6606e5f34d0bbd222f9058f
font_01_sfnt_off00012738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12738 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F4F 11108 bytes
SHA-256: cd55d5eea9260287e3e1dfabfee345de142608bc43cb56f7abf475a696a377d6