Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a0f5852760331c7…

MALICIOUS

PDF

70.1 KB Created: 2021-09-27 10:09:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 15a2bf90d6d5c461216d3da221e42e19 SHA-1: 7fd6ea595fc7815298fc8f6b230f6f9f7c9e9fed SHA-256: 1a0f5852760331c7d6080747deb48f54dc84f4372f48b1504baf41e33cb6627c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm. Some links point to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://maytinhdalat.vn/images/uploads/files/jirimifosepebukugolozupos.pdf In PDF document text
    • http://transchem-tech.com/Uploadfiles/files/bibetepuja.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/vabewikipexi.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/28265297969.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/134394892161496cc7d13aa.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/76762221073.pdfIn PDF document text
    • http://getdol.com/page_data/file/vujom.pdfIn PDF document text
    • https://sassanoproperties.com/FCKeditor/file/rivavatukaxamawamisumata.pdfIn PDF document text
    • http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/vewilakeboretekapekezasof.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/puvujafofim.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/93532731857.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/75491482733.pdfIn PDF document text
    • https://khanoomhoteli.com/basefile/khanoomhotelicom/files/tupasoj.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/46935272377.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/bb556a977b7b64e4303a0f09d7b78fbc/jilufuvotojibe.pdfIn PDF document text
    • https://5ky13lu3-1251.com/contents/files/likize.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/285cce76f95d7af8a67cd0490e1f825d/mixezizaz.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139d943790fd---77664940505.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151101a01196---mutekavojufizapo.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///6283858269.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/kalifazanimipuvope.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=insect+pollinated+pollen+grainsPDF 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_off0000b090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB090 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A7 10640 bytes
SHA-256: 7a8f54eddc895ec005a9176ca7a43de36d05fdd7fd9792b5b2158270d16ed7e6
font_02_sfnt_off0000e0d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D9 16744 bytes
SHA-256: 41a794318e0d00772b0bcdf7cadb2f923567493cc3e2a345713773b9bb5ce8ba