Malicious PDF — malware analysis report

Static analysis result for SHA-256 5677395eb4d8bbfc…

MALICIOUS

PDF

72.7 KB Created: 2021-09-05 14:46:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4054dc7e6c9afaf92c66ee3c0178fffa SHA-1: 70609307114f5cd20af1291272abafaa48d83e46 SHA-256: 5677395eb4d8bbfccc12b4154785ccfdde89d39ee00d35350b4fd6f827f6b96a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://podiummoda.ru/userfiles/file/96319745227.pdf In PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/71313586766.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/bimunimuso.pdfIn PDF document text
    • http://dzbnf.com/upload/file///menuxeweran.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/397a49f18e6ac9b4dbc6e5af27e4395c/66413390996.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/56046824462.pdfIn PDF document text
    • http://tiga.co.th/ckfinder/userfiles/files/21900986825.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/memiloxas.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/mofonewoxilaka.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3942c3c159---remomilariwom.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160942f63ad9c2---xigibelarom.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/31340110400.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d64e10ba7e3---lopirerorukagiro.pdfIn PDF document text
    • http://mytmbc.org/fckimage/file/7824296222.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607482be9946f---lapufevudutawikab.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a847baa032e---65514049884.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/44792103003.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/80595678586.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/aeaqs9jrkkl3mfb3p5a26p6ami/7736481354.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/lofelosivusa.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/warajawobunijigezelejavo.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/kizirixedobiti.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c133b01bd1d---81299162221.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=geography+map+grid+worksheetsPDF 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_off0000ba49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d25b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD25B 16104 bytes
SHA-256: f1330b1e333351259000962e4520a0c965ab8c128744038609eb13ed9fce990a
font_02_sfnt_off0000fb96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB96 11020 bytes
SHA-256: 925e82eac34a4dd436a0b1654d364aec36396dbffaf608ed5ea879e4d38fb8de

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