Malicious PDF — malware analysis report

Static analysis result for SHA-256 2255f630aa999d47…

MALICIOUS

PDF

81.2 KB Created: 2021-09-03 11:15:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4ad792521e23dc0e90da9d54f812d9a9 SHA-1: c7af26c463506c88e048b020fbb680711caf15d9 SHA-256: 2255f630aa999d47daca71e454f6985c185a2bdc30988c7cd96a5e1d280783ef
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, with multiple URLs pointing to compromised CMS upload directories, suggesting an attempt to host or distribute further malicious content. The presence of numerous links and the use of disposable hosting reinforce the phishing and malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://studiocariola.com/userfiles/files/12839428136.pdf In PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9d4a8ea84---kubavurafodavaxavixebuv.pdfIn PDF document text
    • http://kcobafl.org/ckfinder/userfiles/files/17556567925.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/s6rj9g5gfej9cpsqju8e5qt7s7/gigafir.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/c17abdfd545dc5172a9e06951e57e3c8/68983716882.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3c3837338---jaradalikelojoduko.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/psath8geo8cfh4tncoadgcjp0u/54199927693.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/gufajotolujapot.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/7e5202f430ee62c676b9838709d1a1cf/tojisom.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/57490633847.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210602_EE1484FD82933334.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1ced5aa17---73203929450.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16080bd6872db3---kikafowekiwoxebe.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e00dc18015---88131766425.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/42957509383.pdfIn PDF document text
    • http://mrmax.ca/clients/9797/File/bekotowoxiwe.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f2b8f3549a0---xinizosepoxikar.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/denumejetima.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160886df7294e6---gomelawopubufejujujajewom.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/numar.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/13707076607.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/50938437352.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/wedinulo.pdfIn PDF document text
    • https://flying-vikings.net/UserFiles/file/mawixokugofubobewabor.pdfIn PDF document text
    • http://tochalco.com/uploads/files/koragovara.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=grafeno+pdf+libroPDF 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_off0000d5f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F2 10404 bytes
SHA-256: bcad9aba1f34804628f028c8500343a65e9d7e5c0b3ab731729ef336f7bb20b1
font_01_sfnt_off0000ed47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED47 19256 bytes
SHA-256: 56ade954f34074e9b131d8c9507ab1d07cc477d2cc0b9b6a1d795b213360c68e
font_02_sfnt_off00011f18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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