Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9d7ae4460e207a2…

MALICIOUS

PDF

76.4 KB Created: 2021-09-01 04:37:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 871c91b80590090a2f92044e6bffb30d SHA-1: 270f162b53b5c723860f1e20f7e713a44982999a SHA-256: b9d7ae4460e207a27931526264638da23d0e1139133409ca174290374787159c
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9763

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://inwebjor.ru/uplcv?utm_term=base+plate+in+steel+structure PDF link annotation
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/46990254368.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b27ab1ee2c5---65183569044.pdfIn PDF document text
    • http://ccspevents.com/clients/24998/File/niguxoxobimololamidogok.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/37853313068.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/9upiuskodog69unnqq8nrde6hu/37649555731.pdfIn PDF document text
    • https://floridagreatescape.com/media/file/16591115373.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/e0fda088a0fdad492231bcaf2c38c172/rimikefuxovoronigogekoruv.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edb771399b0---74237566193.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/pokofamixebadukizuxanirud.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e91a5ac16be---tenoxipapepexuvepezap.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/76bb4r46b52k8rspnoi3jate17/ravofexunewemu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100112b1ae6d---48311582609.pdfIn PDF document text
    • https://attack.lt/images/files/75839433982.pdfIn PDF document text
    • http://aatmicscience.org/asuserfiles/file/tigivoxusofinimuxov.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210627211002.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/xokenosaxo.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16085da366c346---21372772655.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/35487726310.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079adc52ccbe---zokovawawekoweguxiduvul.pdfIn PDF document text
    • http://sam-global.info/files/file/lanekajawimizaj.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/dagemireri.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab25e426be9---banijazelufugudijenov.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c01f757033d---57061919343.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/48098678932.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7ba8d3a4ec---lulizafezasodad.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c37ac1656e---44094412675.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC211 10400 bytes
SHA-256: 028f71d7783227575aee400a021da312d00980308e4129f4e33300d3619adfce
font_01_sfnt_off0000d9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BE 2132 bytes
SHA-256: 8ad1629d78958631526aea0a74d0b163a5252944052d54f78beed5240939c1a1
font_02_sfnt_off0000e365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE365 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0000fb77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB77 15296 bytes
SHA-256: 1eb86202138e9a9694e47c221b28a3d11df8448257c62736b5407cd230c3f678

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