Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecbcd76f5036908e…

MALICIOUS

PDF

87.8 KB Created: 2021-09-03 10:49:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 606a59f004c7605048366d33ec44c62c SHA-1: e6e3c83cdfccc9e887154a14afae94057e2e4010 SHA-256: ecbcd76f5036908e2135f3c7839939d4ebe1456837f09199b965e43ffae09f2c
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://nomylo.ru/uplcv?utm_term=adobe+photoshop+cc+tutorials+pdf PDF link annotation
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/c96b3855151ef015b8affe101999b6b7/korufo.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/wigoriviwa.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/7upicpi20vc18ql5j3kpr6pma6/suwosomopow.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/1umr6ustgq7u87qjljfe6vga7c/puvudopak.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/81578639090.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/602b3e26590cc00d6a08cf6b433cf55a/94677630518.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609debd67a365---tibigopedawogis.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/jabobemutofexumiralalefi.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/sowogixuzomil.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3827690ee---doveku.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/78170136316.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/2ccd6npv827mldeiti18dl50j0/35940514291.pdfIn PDF document text
    • http://sb-78.ru/files/file/sison.pdfIn PDF document text
    • http://benhvientantao.com/img_duhoc/files/83490950366.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/85898271608.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/17806331708.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075bd3aa09a2---45925795371.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/8b833b4acaef5dada0b0536510cf3e1b/76241507498.pdfIn PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/lurijoridereruti.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/63013747679.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/42b920af59aab5de80c6b0ef7ffebb5b/penojezebebafu.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/7505643d5ba0f8bb32d6eea494510d13/36204920532.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/3qm3kijh4as0g3n3i92oa63l9s/1550923900.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/p8226c9ulh9teoitc4cfv6dnu4/lanasupek.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_off0000ee2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2B 19496 bytes
SHA-256: cad459c741c0363e29d37b0e5d96897cf6f0737299325f437bf478c15e122161
font_01_sfnt_off000120d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D8 10836 bytes
SHA-256: 0de7d6355fe0bf632f6cd88cda7e3023c3aa36951e53976bfca5e35076abb380
font_02_sfnt_off000139c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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