Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2743713e8c0a3ff…

MALICIOUS

PDF

77.9 KB Created: 2021-06-20 11:45:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 758d0d108e4d6750c592d633e23e7a5d SHA-1: 3bd28a2e61b4c20ede534c4f3037382ee3ae3888 SHA-256: f2743713e8c0a3ff025b6977b4d7dcd9ddd92159ea557cb6f8652112ec5bf5e9
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which appear to be compromised WordPress installations, suggesting a link farm designed to distribute malware or conduct phishing. The presence of a 'download' button lure further supports this malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://infrive.ru/uplcv?utm_term=candy+crush+apk+mod+hack PDF link annotation
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa979288a5---5526301018.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f71d2692e6---vupawugadi.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/e7429b3ca97bc1f2e1ce73f7dc433fc3/lemojufapofikej.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ad7afcbb4f0---87576620207.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/550dc42235f07397e7d09e91416b5cb6/nomederupeto.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/9519059d8aaf2f6d3a2b8634b0048f7c/27527237743.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/nat8vtmc8b5eh4sfm2j7p9gp3j/90568943371.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095c00671ae9---32015952009.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/wokite.pdfIn PDF document text
    • http://lacyfamilyunity.com/clients/2/20/203fd950dafdada58ea32e7b96f0d147/File/koxuputopawusujigipuxapi.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a33b0d01c---fomarozeburakej.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/zunaworozazef.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/nagexoxad.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/1aprsottqedk68qde1rdu2525k/dulexed.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FE 5108 bytes
SHA-256: 4d92b4b4c386750e1ae5d41163ab0a1a0279dbabb8a568e8aa16ce870389a101
font_01_sfnt_off0000e921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE921 23452 bytes
SHA-256: f97f6c25fb5b37aac2858c007e0f016f74829e9d43db73bb4c1786717384b08f
font_02_sfnt_off00011b59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B59 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361