Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b294af90ed30762…

MALICIOUS

PDF

87.1 KB Created: 2021-08-02 09:08:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 11b5d483b16da6fd250fd0e877facb00 SHA-1: ef0c33be8dd2ac5a376d8eceae3fc8b847609fc1 SHA-256: 4b294af90ed307624ee2566a73460034631561b5f8e07f900adf310b8d18d7e2
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting domains, which are likely used to distribute further malicious content or phish for credentials. The presence of multiple external URIs and link farm heuristics strongly suggests an intent to redirect users to malicious sites.

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 http://unicaconsultoriarh.com/images/files/vudifaxenuzojuvolabam.pdf In PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add6b4e2cf2---6436128183.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce49e04ab4---67667572616.pdfIn PDF document text
    • http://fitviewer.de/files/file/67163066452.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610523094c4d1---sizovudukiwev.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607240c3a03c9---59112320751.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/tefifunavi.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b45dd797df2---zavidikubowuv.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/odolos0ur52peheev1lripm9f3/12655301402.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a8d272318---76045122378.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/89405510981.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607281be12836---zusirevidoxidumegigas.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b3081136023---kebuz.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/nebopotixutuv.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/sajinep.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021070620553793.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/givikur.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/dece058f39fbc0607831a0736376d79c/lisanibiretusufis.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/64471825639.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/7528373935601eb5d0a88d630466cd7f/sodidowaxegulowog.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/21950620801.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160948f319a4c1---bebisifujikemunefafer.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/29934522185.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160e89aa8700d3---22267886893.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tazin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=que+es+la+estructura+de+un+texto+narrativoPDF 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_off0000eb71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB71 10688 bytes
SHA-256: 3b56c501c5b1468a5e7ede086bac9351a14aee1322d292d05019a20ca044cc56
font_01_sfnt_off0001043f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C51 19356 bytes
SHA-256: 5296e2cbc332e1c5448e794563f292dc4d98a4a3e9459a00d1b1cdc1b30bd041

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