Malicious PDF — malware analysis report

Static analysis result for SHA-256 b925de5805702904…

MALICIOUS

PDF

82.7 KB Created: 2021-09-12 09:53:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: b9fdf564b81bba78dad4eec0e5c7ad2a SHA-1: b26236800fc04b34089f6e8a1c3f50e6cdc53f0e SHA-256: b925de5805702904082d1269be294a6996be25bdbbae10dba69cf9fbc0a8d628
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous URLs, many pointing to compromised or disposable hosting, suggesting a link farm designed to lure users to malicious sites. The presence of 'utm_term' parameters in some URLs indicates an attempt to track user engagement with potentially deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=pdf+to+kindle+file+converter PDF link annotation
    • http://chochosanencino.com/uploads/files/fusasewenolinipatatod.pdfIn PDF document text
    • http://warmistore.com/userfiles/file/judugodoruvepag.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130e004a3585---4974171511.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1631142981.pdfIn PDF document text
    • http://mycoapaisyl.com/webimages/files/dukiwajagivuzubuzadux.pdfIn PDF document text
    • http://rjt1.org/upload/files/81842763999.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/rakixil.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/surinuvovagamijo.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/55614656954.pdfIn PDF document text
    • http://lmnn.ru/userfiles/file/sarawitubiloroxekasi.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/vazirisumuxevel.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b18e8616f3---bonisemuwu.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/49762606135.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/69546438095.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/goles.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d24999f237---69798990739.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613334e266af8---25354551072.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210901095558.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/wimusajosilijujibivaxor.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e3036865e---20052340178.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/36106644192.pdfIn PDF document text
    • http://hacsbathtarntaran.org/~/userfiles/file/zokifudozefo.pdfIn PDF document text
    • https://equalland.com/uploads/File/jokegomovujas.pdfIn PDF document text
    • http://kbinteriery.cz/userfiles/file/34529532370.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_off0000e080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE080 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF892 17544 bytes
SHA-256: 28edb6438ceaabfcd8deed64a9a90d54baecc6c1e261a620501069965dea6e1f
font_02_sfnt_off000125d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D8 10296 bytes
SHA-256: 258732716e7a95610f4e43e6dcf09ab4ac19485de505392d33d095af662890d7

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