Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab2175853894c6a4…

MALICIOUS

PDF

91.6 KB Created: 2021-07-02 15:12:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: e3c44b7ad8767bf9a887df1bda25327c SHA-1: 53b06f2e42db673267ca63bd4a648d8c6eea48cf SHA-256: ab2175853894c6a48239da170c76e501aaa25a4097d5c5e0d4c37097a9b90f8b
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites or disposable hosting. The primary purpose appears to be directing users to malicious or phishing content via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://arhometutor.com/userfiles/file/91522560430.pdf In PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/86b83ff4f00ecdcf4ca6206f5dc69d60/vowadopuvowekine.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/5c3a3b27659521018fbb3e45b0b9015e/mimegupovimulopavikupi.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071f45fea60f---19161385938.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/93j3fk4koephe550m04be8ah52/gulavoxofex.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16085a5a0bafd1---464584321.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160924348a1081---35641262887.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c315b076f7---59245489711.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/a108a8ee8b1ee3929cd42ddf21ca3050/dizorexenezoxasole.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b012915cfbe---dolebodukilajuzosadub.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087bc39caf15---rifoluxejikeki.pdfIn PDF document text
    • https://cafe-malaysia.com/contents/file/64628421571.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/38lsfs6gb5v2d9oaq4uu964f14/xijojuwapebap.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/jubakatulibanawasozaxi.pdfIn PDF document text
    • http://chargers68-50th.com/clients/3/3d/3dd154274af4887fbe356f6dcfc18689/File/xenigurepavon.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16095560b475b1---kugorul.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/9f8b397216ee0bbd4c4e12096c8bd4a2/67709259669.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021051503023873499.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf9d69c9d5---17427576759.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/tapezasituxatopibiwutivi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+import+pdf+into+powerpoint+presentationPDF 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_off00010217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10217 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011a2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2E 10692 bytes
SHA-256: c70ab94beabcdaacbd2f5a13e1a0bf90c75584bd1d5f67491d3da40632f3d538
font_02_sfnt_off000132b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132B2 16976 bytes
SHA-256: 3135cc3f3aad629d28421a17b64d8bb9dd28acdd848917be4918bfe1a9a8c1d7

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