Malicious PDF — malware analysis report

Static analysis result for SHA-256 a68bce5a2144c618…

MALICIOUS

PDF

74.8 KB Created: 2021-09-08 04:31:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 850833d15073cb74eb2733cc3542f827 SHA-1: 5f846d4eef941b935d3419618d04b54bd0a524e7 SHA-256: a68bce5a2144c6184eea2ff29d19da0490ed6454d72155cd8e5594bd6e5efe86
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to websites hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve further malicious content. The document's structure and link farm nature suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/5b67b410a876204178896a5c4ca63960/81953034238.pdf In PDF document text
    • https://traffictkt.com/viking1/uploads/files/pepomovowijebamorek.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c948f4c9686---kaxopubetuwomuwevuvo.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/73778368227.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210901_61AA676B86E28159.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/gawibelasawamiz.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/61979378273.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/0a971885d30d122580f4a335c27d5649/zapepajoderasur.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/93835941623.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/3519575850.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/zawudunujaviz.pdfIn PDF document text
    • https://ayurvedaemart.com/uploads/file/45268888989.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/5e4vc8bl8bhse8dbg8plrnfldp/69293728500.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f3711e486---duwikolagutizuwigakulepu.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16089329ec5162---jazol.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/jrgoh4nthg4g6pqko7scpsl6s2/64158612464.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/71270157761.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac92b0da108---39561433816.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/44093172795.pdfIn PDF document text
    • http://unityproductions.com/upload/files/nunojagosavilofig.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092413ea7c83---dupizatupefa.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/71875675140.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/66763484468.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=periodic+table+scavenger+hunt+worksheet+keyPDF 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_off0000bfd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFD4 11248 bytes
SHA-256: 1b99168d3bb990f85b7a177929527eec332aac0789b99dee980900e68d95f59e
font_01_sfnt_off0000da05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA05 16856 bytes
SHA-256: 6fdbd1497bc8db4e3b6f77fc0868b209c38cfc776f23978ed7b422748d5a22ff
font_02_sfnt_off00010572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10572 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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