Malicious PDF — malware analysis report

Static analysis result for SHA-256 9289bf21ab03af02…

MALICIOUS

PDF

85.5 KB Created: 2021-07-06 05:04:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: c817cf04a6df0bca5f87f643f69701db SHA-1: 60c7182a7832f29b14498398f09777c77684cfad SHA-256: 9289bf21ab03af02911a6bd8f469e2af9068efa0ea1577e28492de27a425031d
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Multiple heuristics identified the document as a link farm pointing to compromised WordPress upload directories, suggesting an attempt to distribute malicious content or phish users. The presence of numerous unknown URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb304086d38---62379937921.pdf In PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/64e3b269013b7273b73f527b4f15f6c1/kazukokibafukowizusewamu.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160d9f2cef017d---zenevavinepenixosixitadi.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/fezameketoxek.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/zobolu.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/58666507951.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f88e8468f---gojogelomesitakele.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/57004789951.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/zelotojasixola.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8e1d8db5d---70034785603.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a426ffe26ce---kikesanixibit.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c4032c28325---30209280518.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/51391733212.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/4o2dsgc8qaoau4h5o95upk6tnn/zibutarixese.pdfIn PDF document text
    • https://mimpishio1bet.com/contents//files/kikubetijaka.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/30617157196.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867de89e04d---88680240682.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/55740355072.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/bezud.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8c8edbc8f---27667121361.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/jedawuguli.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718959ae441---74782027258.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/2d68df578e0a47d5fe141858f1e33386/vuvezokejurosep.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/siwagonorotadorud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=procedure+for+registration+of+dealers+under+central+sales+tax+actPDF 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_off0000e75e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75E 17360 bytes
SHA-256: f1b0214fbff31febaf2734442dd2e44429ad5cc654655b701d59545be21e3936
font_01_sfnt_off000114f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F4 10856 bytes
SHA-256: 83984c57ce6293ca450a8953c02bd92be4b52ca2774dea8fecb76fe998aa1f0f
font_02_sfnt_off00012dee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1