Malicious PDF — malware analysis report

Static analysis result for SHA-256 920fa08331f94702…

MALICIOUS

PDF

80.9 KB Created: 2021-06-18 13:23:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 14f6051cf12d1df9b0a3ec57f38419f1 SHA-1: 2de797eb0e342c2cef7faf8bb9d6a845dbd7bb0c SHA-256: 920fa08331f94702546d62b17adbc4508d72d0e5a5c767709c50c1531dc99631
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crewmak.ru/uplcv?utm_term=letter+j+worksheets+for+kindergarten
    • http://legalinet.eu/userfiles/files/62338366298.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/bb98a4tc8d5k9jtp4ai0lf8rf3/37756012729.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/905e90f64ca3eb6ee3901d151885847c/givopalivi.pdf
    • https://samngaimarble.com/html_upload/file/62676752576.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093afaa8cca4---92009185715.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adcdadd438e---48054988186.pdf
    • http://fygl.net/uploads/file/130203436189.pdf
    • http://hoshitorionline.com/uploads/files/tenixuvogezegu.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/1986cd2fe72a2687f289f9be22de98a1/39802487149.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac68ae7b37f---97001578015.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6ff83e3cf---tirasepedonefekixof.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/a200723029dbf0bc9c6149a8112772e0/67397999883.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609c50e78667e---pekulit.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d34ab7b74---3650536620.pdf
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/4471f1d353ae8ba39e8565ced077461d/46290808167.pdf
    • http://akkoryazilim.com/userfiles/file/5608090374.pdf
    • https://capitalsyndic.com/userfiles/file/6857810073.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/sg8ianvqpcs3j7atfhleljlgbr/ribikuwasi.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/da722ef21a16e9ad3d037b0e295f8c30/97742491386.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2ed.bin
6eeb7ec882b183623604a4c51c49a724e35797aaf71c219672d83b8e822f5e47
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2ED 5312 bytes
font_01_sfnt_off0000f516.bin
ee57289d0f268310afd3b5970df28a1ab743b2118a8e7a55c9bf2d26ce3442ad
pdf-font-stream PDF embedded font (sfnt) at offset 0xF516 10728 bytes
font_02_sfnt_off00011a10.bin
1540cf1aee614f7bdb861a6ceb09d0a97705cf06a7caba9b5449b1a2874f7077
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A10 17704 bytes