Malicious PDF — malware analysis report

Static analysis result for SHA-256 925ed25f7c82d8d2…

MALICIOUS

PDF

71.0 KB Created: 2021-09-18 00:17:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9e0e6bb78685db495ab100b7a05f5c90 SHA-1: d33c225fbac156f5156b5a75e4a4f6a0a68920da SHA-256: 925ed25f7c82d8d234003232ff7b5cae34003423483fce3aa4f91bd1ae4412eb
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded links point towards an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://fotoprint.lv/downloads/file/81954139602.pdf In PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/zodawijazawilo.pdfIn PDF document text
    • http://hzaidele.com/images/upload/File/40637872165.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/82787460605.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/moguwefogasigawoxekog.pdfIn PDF document text
    • https://uslugiinzynierskie.eu/eurostyl/photos/file/44226191610.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131349eea299---70587030508.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/27495653467.pdfIn PDF document text
    • https://ibericadearmerias.com/file/70823865906.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/tomebifolaromuxox.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/nojefateboxewajedabudeta.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/11944512160.pdfIn PDF document text
    • http://pagyesa.org/userfiles/file/20210909075720.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gawomimenekoj.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe4acda6a5---taxomegabiw.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/wadivuvuwux.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/50661016350.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/28438441274.pdfIn PDF document text
    • https://ghnservizi.com/file/4159571243.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/7acc0955a0fc9a88135ce5ccdfd62add/pafiramimido.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/47368900175.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/1108164339.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///kipaxokosudogi.pdfIn PDF document text
    • https://oxfordjsr.com/userfiles/file/tigoroganizikavalaxoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=kirby+the+amazing+mirror+gba+downloadPDF 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_off0000b454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB454 10916 bytes
SHA-256: 5bc0c1be2c2a8ce473bf76ff7d131ca924ddbd65a8b292ce8c69108a01029088
font_01_sfnt_off0000cd45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE557 15872 bytes
SHA-256: d5918f5ff469c2f342192fccf3c6308ce84d20c470039dad144448d99eb289cd

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