Malicious PDF — malware analysis report

Static analysis result for SHA-256 99b1a24c0c57819a…

MALICIOUS

PDF

71.0 KB Created: 2021-09-17 19:44:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c803c6f92b511f33ed5fb27a4a551be6 SHA-1: 2b18c43e8957813f67a780fb2e4877e62c63a4a2 SHA-256: 99b1a24c0c57819af110e7408d2d3c799b2dda436d252f6c56306f2b7026e5dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting an attempt to distribute further malicious content or conduct phishing. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://crewmak.ru/uplcv?utm_term=app+to+lock+photos PDF link annotation
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614046af60ff1---19231937964.pdfIn PDF document text
    • http://daiichihousing.net/uploads/news_file/xosuteremujajisew.pdfIn PDF document text
    • http://trongtinpc.com/luutru/files/wizilovexudinizamuboxu.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/jesanetirunubolabozil.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/161427f3056aba---dukigodilup.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/83448985841.pdfIn PDF document text
    • https://sibconsulting.com/contents/files/xubepakabewirevi.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/30489024296.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/dameji.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/1158024815.pdfIn PDF document text
    • https://kawanmto.net/contents/files/kovimakezoxumifizuzofa.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021090708305273499.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/98332714281.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/kukiburezanixopilozifaf.pdfIn PDF document text
    • http://haiannweb.com/uploads/files/62638035786.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e373431e2d---gewekogesefepetuji.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/xezezovojofomevepi.pdfIn PDF document text
    • https://masukpt2.com/contents/files/sasabitavubirul.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/zaluguw.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/kogegabetewudiji.pdfIn PDF document text
    • https://flammerouge.ch/userfiles/files/vivadafeluzeg.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/87586872790.pdfIn PDF document text
    • http://normel.org/files/upload/file/retinelasege.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/neguwotunijanowezekuz.pdfIn PDF document text
    • http://steffis-strassladen.de/userfiles/file/puzukav.pdfIn PDF document text
    • http://tulga.ru/editor/files/jaroromi.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_off0000b6f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6F7 9952 bytes
SHA-256: 4c84c52e2848f15bffe5270963c3fef3c8a6f2b220c1706e81f2bf11e5c87541
font_01_sfnt_off0000cd31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE543 15972 bytes
SHA-256: 13b87dec97433b21b11e8073794dd3b5181bdad48a99a3268759041ca1e947a3

Open this report in the interactive analyzer, or submit your own file for analysis.