Malicious PDF — malware analysis report

Static analysis result for SHA-256 55f7f14508c6d174…

MALICIOUS

PDF

127.1 KB Created: 2021-06-25 14:06:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: fbc7ef04a0a1ff4d76793c85de809731 SHA-1: 8685cc081747d8b2a575e7a0585bab3f85b5cd1a SHA-256: 55f7f14508c6d1746aefdca100e3c10285caed9a5a0d46c945f8ddd2eb9d3b6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress upload storage, indicating a link farm designed to host malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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 https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1b396478e---zojitematubaxikofapovit.pdf In PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/c34acf5d2d226ddcda36c4aa09b6003b/nudupifiwasagawusutevep.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704839de31f---57248384510.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3daeb8a7e3---mozokikapujebonojevupuz.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/88554859247.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/82094041437.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c374bcb06f8---niwutujowo.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/d280d74676207ec56d29dfe4a26bf3ed/45219901545.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/bctvn6j90a38lebmmqk7pa7h84/51276709646.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/c5db0ea6ad817e694cafa8985f14024b/73397785143.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a717b60168---86432985451.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083f1ad0d67a---zutadajisepimodug.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb9235240c---fadutonufevog.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/69157d142a3a34ceb8cea4714cb7e178/gewebevade.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/e4c46510ed063a88720c35ded823c741/92486544183.pdfIn PDF document text
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b1d432afa---dokajuziwurow.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/a8002ef00d8a4be7f19db4de93ad9383/10505188403.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/99b7894aad1e8e250d42aa5a4827f0b6/xadotepadid.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/6359c56a631220354c13ecbe797d92a3/84884748802.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=2+x+2+contingency+tablePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17199 16320 bytes
SHA-256: 301e509c7ec618f800eb8bc8d9fd7000e187428ec908e9490154744cb3f6485d
font_01_sfnt_off00018785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18785 20844 bytes
SHA-256: 986ff2271d70f31bc947aa4c9f754f66348a8c294df9cc684920c3f5b6f12a57
font_02_sfnt_off0001bed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BED0 10516 bytes
SHA-256: ef8e40b53205d179e66f3e89dd45df5d7478c45ce86cab18243afc86fb003f66
font_03_sfnt_off0001d701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D701 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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