Malicious PDF — malware analysis report

Static analysis result for SHA-256 8920c0cbc96ffa3c…

MALICIOUS

PDF

94.5 KB Created: 2021-06-28 06:53:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 73a6d727c82b4c783f51ab8f446b96f1 SHA-1: 9aa3cd63734fe39973ff893e6a9c3bc08b6c139a SHA-256: 8920c0cbc96ffa3c89fdb7265db4bfa765e4c9e8136fdbd2af883e9b1461aa33
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classification and ClamAV detection as a phishing trojan. The heuristics indicate the document is a link farm hosted on compromised CMS upload storage, likely intended to trick users into downloading a malicious payload. The presence of embedded URLs and the 'SE_INVOICE_LURE' heuristic suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4f3b11310---sanupefufijeka.pdf In PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6a625da10---vuxupodirano.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce4edea56f---vogaxuligokulemawor.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/709d6f1341f78063267a5796db5dfced/17656093326.pdfIn PDF document text
    • https://mauspro.net/upload/files/vukeba.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f04c1820eb---76665550555.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/49740435209.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607622a86279b---16283873819.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210603003052358128.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/7d823824d256485466b41be8e4da52a4/sunexitoxaxozakosujela.pdfIn PDF document text
    • https://congchung7.com/upload/file/nonaxilekidale.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/numuva.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/87b8901841d2a1d5d465c5568a521acc/jelaj.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/16086b110363ea---potomiradawogaguso.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/qaofumfacj37th24tb0ndl4dj7/90745903157.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948f5fa2fc2---goniki.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f17133eb2---vowikativazefimibowupopa.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/146e303cb33fac6fd931bf4ab6006e1f/24545448747.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/0hv80jjcs66284b1hgjadr2pd3/xagovekurofawajenu.pdfIn PDF document text
    • http://soles2walk.cz/data/file/bonegutejizetamatusoguwe.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a274d6148---77190804391.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/zuzomufagiwebemigobujunad.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b227d1c1a0---71092646804.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/8bcc3676bcb7570ff5afe9730f0225f6/14984744291.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=what+is+a+branded+housePDF 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_off00010dbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBD 17832 bytes
SHA-256: 0c1d02d030dc44e544b7e153320713e503802ba6411248b1c280ac3562a0f4b9
font_01_sfnt_off00013cba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000154d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154D1 10532 bytes
SHA-256: 165b0ac5544b0c5fe499b59b271cb84b801803b49327bdcf33d886c9fbf043aa

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