Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae550ba33a423d91…

MALICIOUS

PDF

89.6 KB Created: 2021-07-01 17:26:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0c93beb33161d678546c0ed5aac4022e SHA-1: 520c6cc595b8d271a83aad1096cfdcf72a62e487 SHA-256: ae550ba33a423d91190b9a89194bb243f9c5cfae8b125ca726008a2e69e129c6
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to websites hosted on compromised CMS uploads and disposable domains, indicating a link farm designed to lure users to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://nomylo.ru/uplcv?utm_term=compare+and+contrast+lutheranism+and+calvinism PDF link annotation
    • http://permianhighschool1970.com/clients/e/ef/efee9fcbc667252fc4b649c8163d3733/File/mogefimeb.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/7bfb3ac980778bc5907800fd0aae2b53/bosegotepebukutosinike.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a14e9a3fcfb---mitinuru.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/30317401434.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/arnso58rmsi5pop1jmq3c94g27/57422216641.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/serubodoleponaw.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/94046788319.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/b1b39b88d32c4d69ed211fe184f5acb5/rawokigamep.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff78071c48---18609935911.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/sosewudegivomabipowapin.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/67tajl7j43j38ver8hk4l8059l/zokuxeberodazosexejulewu.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/32326041861.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/8913586271.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/mufuxaxiduwi.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/f2c7c6e80e60f3e1fd468ad5224e5259/vokabobumojo.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705a2b5fe27---68537283069.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/medobuk.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/jugavaxizofizanufimavan.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a1bf8e4e1---pudonenodanasalabuk.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607fed9a85c99---69105669965.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/69755116774.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/e6ec05bd0d019234c6a6628bb4a1baec/zawasupeganorilo.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/topujezisogojip.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD26 16436 bytes
SHA-256: 0ba3b72f457891602135baa1577bc27e8c7652b769f67c09ba068122c31a6df1
font_01_sfnt_off000127a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A2 10976 bytes
SHA-256: 6fda731cd3380f424091af879748f6ea27b8752f293934603591fcab34dcba08
font_02_sfnt_off000140ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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