Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfb14f639575d59f…

MALICIOUS

PDF

86.1 KB Created: 2021-09-02 23:44:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 481ef2edad50346c5432e6dcc976d737 SHA-1: 74949444f9168e34a8f6dec1b42733e276f0ad92 SHA-256: cfb14f639575d59f739a536a3f0dfe329c92d6878ee23bb5f98e56cbb1f1a361
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous external URIs and is structured as a link farm, with many links pointing to compromised WordPress upload directories. The presence of these links suggests an attempt to redirect users to malicious sites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://oniceh.ru/uplcv?utm_term=rheem+prestige+furnace+installation+manual PDF link annotation
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/5cc3a7dabc5af15b1264b91e57de3960/jigidupubekogipaxiwoxinu.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c59c94431---94992574193.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9a99ea1a2---56006565338.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/8eb87d772de5ae8fb5fd658aa9f5292a/jafekajinif.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/nifuzewoxoforupibela.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/142113016827.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/48908722815.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/73699081108.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/dka3ql6vu0jgdsamtknmrecqib/85478668308.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/61815574391.pdfIn PDF document text
    • https://fcr-fomentoconsumoerenda.com/uploads/files/pulatiru.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/20441218795.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161296e3659af5---joxifojuzogidukoz.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/tagoxezilob.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cff3c10d435---90305588921.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210624082114.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents//files/89715952588.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/xurovazazetavokatorufiga.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/mozabukinapu.pdfIn PDF document text
    • http://simmsfamilyreunion.com/clients/9/98/98d47f1658d09d39d77ba56043454c9c/File/85964195434.pdfIn PDF document text
    • http://kubak-ubezpieczenia.pl/userfiles/file/27686228706.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a5a2a07316---78062589820.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/7f4098398605f134102cc1eecdef5c16/varunujaza.pdfIn PDF document text
    • https://thietbidiensino.vn/media/ftp/file/38597330677.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_off0000eb45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB45 11072 bytes
SHA-256: 8db07f30ee8139e9fd3c9a4e59c3d8ec14b6dcc942205a2a8162211c17c9b227
font_01_sfnt_off000104ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EA 17568 bytes
SHA-256: 0e1a278ac4dd66f4480065b207b80e8c480436c15281290da7fd3af84a95ce42
font_02_sfnt_off0001328e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1328E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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