Malicious PDF — malware analysis report

Static analysis result for SHA-256 432d4a1dbcb2ab6c…

MALICIOUS

PDF

75.8 KB Created: 2021-09-07 11:07:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 47577252fd7ae0c1e074568835fa8a15 SHA-1: 5b60ea900177cfc62c2a25bd1f45e73520a5ec5b SHA-256: 432d4a1dbcb2ab6ce3b621d865d9b2b30e76a195bef6fba0eb89ff1afb0f29cb
156 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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 http://kokocurry.gm/userfiles/file/25429539136.pdf In PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/79108764683.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed3336ee7b---58835806656.pdfIn PDF document text
    • https://excore.hu/ckfinder/userfiles/files/xajufafifolitotoluzi.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/cjdln3akvhsvvgsll03hmbs4o4/77240620078.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845d03a127c---zekogefereteke.pdfIn PDF document text
    • http://gurolmumcu.com/userfiles/file/xonekilebipaba.pdfIn PDF document text
    • http://placc.info/up_image/89632519652.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/5787876915.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/40a3ab3d961a8d74136727d4e0ad7798/xekalagufitebakajugajito.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/roxufaroke.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/nebaser.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/31282911093.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/kodudijamosixala.pdfIn PDF document text
    • http://xn--l3chcucnqd9c0eua7b1k.com/user_img/files/94985502389.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3bd9a29fc---japutuman.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/1eb40cc6d40db1d3dcf0c8d276702ff1/61301531626.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cb4155c52ad155caad17aa5f934fde56/73233890131.pdfIn PDF document text
    • https://medprobr.com.br/wp-content/plugins/super-forms/uploads/php/files/981969a96fb8a9c53f5c949f1f077b26/gixefaninataz.pdfIn PDF document text
    • http://alexandraharris.com/clients/36054/File/nokoluluv.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/7198168255.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/75531116279.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=motorcycle+diaries+bengali+pdfPDF 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_off0000bc36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC36 19644 bytes
SHA-256: 1ba7f8d6486d126d5ca746f142de4956ad60c5c297a4495f5ebc1edc1a508a1c
font_01_sfnt_off0000ee87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE87 11040 bytes
SHA-256: 83f1a71d68c32281fdc8d8d2a055464dd30c3679201bca84822471c2750d2219
font_02_sfnt_off000107fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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