Malicious PDF — malware analysis report

Static analysis result for SHA-256 eae72c2fb93c6f9a…

MALICIOUS

PDF

85.8 KB Created: 2021-06-30 03:12:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5ce8887b2e16d9a498eef14ae6bf2200 SHA-1: cb8acae85a449d63f8109cb3f61f7a96452a8716 SHA-256: eae72c2fb93c6f9a82ac322977bdcf524ff7b105872b82049983a2731f4e8344
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. The presence of link farms on disposable hosting and compromised CMS platforms suggests a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/223d5016ab998f59e0948b6ec995957c/vamas.pdf In PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/45d3e50059af8652c098f655d2e6410d/92016081306.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160a8eb9c992ee---91258710183.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/bexibiporufunok.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/torogarowamiwazuv.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/9g3dapkb5q77bocb1828nd27jh/xiladibe.pdfIn PDF document text
    • https://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/834c5c2d9b1b14e8e22952ee8ddedf38/xejutoza.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/xukomixapalumedeles.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/mijufanazisudurikeju.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609bded81b8cb---92740367491.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/6dc739a1ecd7c4301e3e755072ce01d8/58371014183.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/73ed3cf04ca40f5c255b0b8a88ece781/relifizezejisojule.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/suviwabivijebim.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/11617437226.pdfIn PDF document text
    • https://activepymes.com/pub/file/rolebatedipekegaku.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160af70b56eb87---42531501146.pdfIn PDF document text
    • http://soles2walk.cz/data/file/bilisixela.pdfIn PDF document text
    • https://nhadatonline24h.com/Images_upload/files/wuwuwam.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/34e0042ce6d0b9c8c2475c43eb2aba85/tebomuwifarewuxajixejuba.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/57933e0b29dc22b82dba8367af28ad73/89741540151.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e7904df67---9154834937.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/jebepaxuluv.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/69248449924.pdfIn PDF document text
    • http://limoride.net/gallery/file/62694959810.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160732aba34684---xenuzesokomipejom.pdfIn PDF document text
    • http://buildinggodskingdom.com/webcms/file/wovate.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=verbal+ability+and+reading+comprehension+for+cat+pdfPDF 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_off0000eb0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0E 11288 bytes
SHA-256: f6346c8402161cda37d047ebf22cec773903a091c0a9839c227cf491af0f6140
font_01_sfnt_off000104f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D07 16972 bytes
SHA-256: 9bcb268394e0ff5e92c7c5b72a794e911a13f05e8a0bca834b3876b243bbf83d

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