Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e93a2650d85c517…

MALICIOUS

PDF

72.1 KB Created: 2021-09-07 20:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2969c635b45679f5ccae99c229bc79aa SHA-1: 91bca2e05c8910c12accbef1ecf4d0581089a639 SHA-256: 7e93a2650d85c517a43b39e9028028f9885906f5f24de17c1cdb1dd431fa7425
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised CMS uploads, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically classified as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the analysis that this PDF is part of a scheme to leverage disposable or compromised hosting for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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://geodeslaboratori.eu/userfiles/files/nojutagilokudesuvavetig.pdf In PDF document text
    • http://ledseoul.com/userData/board/file/83734617064.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098395f82194---80850704150.pdfIn PDF document text
    • https://rumputhijau.com/contents//files/suguxodijitoxijumitobob.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/giwameta.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/26639005280.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-8-17/20210817104220211808.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/napefudedipibupa.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/35656679860.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c86970c14d1---wimotegoleg.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/34789606646.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c9aa570fd---2798781330.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a64bf67ab7a---xuwusaroz.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/7e42fff3e1ce35128b3e05225642391b/53272032425.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c50fa739d63---52900364547.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/98701748600.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/90372195955.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/9624af92f269d2d77a524b92203d338a/78017538522.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/6ncei4cphsd16i2el9oev7vah7/7904225070.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/xikosojokezodib.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/50810322744.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/32teq05b0ngocccq6qqv9j1sg7/43583706214.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/66ig0u6u8p4t46g0o0273qla4f/67827999322.pdfIn PDF document text
    • http://contelex.it/userfiles/files/91627892678.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210713235720344.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=the+umbrella+academy+comic+espa%C3%B1ol+pdf+gratisPDF 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://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_off0000ba42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA42 16128 bytes
SHA-256: b9eeaa41c61c2b2b416cba28c48540d5260dd05a4636eb6daa6eb62a7360a8d6
font_01_sfnt_off0000e3a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A4 11488 bytes
SHA-256: 6394e051f4058d9ae7b52967522a51934510965555667e2b5c5bad735cb97f51
font_02_sfnt_off0000fe36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1