Malicious PDF — malware analysis report

Static analysis result for SHA-256 82f465466b0a1bc9…

MALICIOUS

PDF

109.6 KB Created: 2021-06-23 20:53:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f910cd37cff9ebb92e4246f5db6a8d12 SHA-1: 1915ad52519208986c45763461b7b9f31eea2d2b SHA-256: 82f465466b0a1bc9ed1c8139990885b72c0d14b593a5d04815aba3a6afcf81cc
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO poisoning to drive traffic to malicious content. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • 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.
  • 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://aldea.work/wp-content/plugins/super-forms/uploads/php/files/02563ce7d06f6023600da1dfc728b93f/33407849639.pdf In PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160c64d5bb4d11---12334332221.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/zurugobutawipovipi.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075930aeb428---puwonanaribuzuxosad.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/ccba5bdfd30b74ed0bc057d4d4a7f0ef/88406454042.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/dd01desa65oh47ridj9c1joh4e/50712194446.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/0599c13222c44af16fa3bef9f63ff15c/lanezogoxa.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/1564536633.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/19a02c0725b2d876fad4bd58d6fdc43d/49605453053.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/8b03d14d9485aafb519d1cba684c756b/22268148668.pdfIn PDF document text
    • http://fedime.org/imagenes/35911034116.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094e2925ce25---95481109983.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c02b9a74b74---kimalekinabuj.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/c0qtgjt7vddn3s1frk3e36unj1/kezifatekesoruponofad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=krishna+flute+sound+mp3+free+downloadPDF 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011fc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC2 3428 bytes
SHA-256: 127632d7e21d4f7d1b17f9b661a0e30fad2e0716b1ff58e82687621dc7076036
font_01_sfnt_off00012c14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C14 5388 bytes
SHA-256: 0289d9b4e6d66df5c1a32802280ebf5b5d9436483fe2054c885679cd94755477
font_02_sfnt_off00013e44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E44 3244 bytes
SHA-256: 2f6799d7f8559ac07365980115ba5ac5a1321d1145bfffe4807f89136c759f8e
font_03_sfnt_off00014ae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AE3 12312 bytes
SHA-256: a012af893d58832df5c3c6574768b93401bb0d62390c3ac8ecfda50366cdd56b
font_04_sfnt_off00017443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17443 16192 bytes
SHA-256: 9c7926b8929b88a1dffb52ec04bcfb477868fd459509337312ce674bafabbb6a
font_05_sfnt_off00018951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18951 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
font_06_sfnt_off00019752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19752 4336 bytes
SHA-256: 549b71f8a0aedc813b18a4e1024b9c4f432418615faa65e9ba7e71856c09e8b4

Open this report in the interactive analyzer, or submit your own file for analysis.