Malicious PDF — malware analysis report

Static analysis result for SHA-256 911b618b328ded09…

MALICIOUS

PDF

80.7 KB Created: 2021-09-16 18:31:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7a4ec6973692850f553446776f544c09 SHA-1: c21a9cf664148edd36e0b3b2b3be431ad2e775a8 SHA-256: 911b618b328ded09e3da82d72c5ce2a9f430e9d3db2dcdaefd216044d00f4fe5
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that impersonates a cloud document lure, as indicated by the 'SE_CLOUD_DOC_LURE' heuristic. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites, suggesting a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the presence of external links and the lure suggest an attempt to trick the user into navigating to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383659e298c---bafepekagig.pdf In PDF document text
    • http://fzcce.com/aimgs/uload/files/81914187293.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-6/20210906231644700553.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/senodosaf.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/bifelofezuwabaxufevexuves.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/42648646431.pdfIn PDF document text
    • https://maria-galland.ru/files/file/vinobipavupabiku.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/vogupomuludal.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16132d578d1203---dokinokisef.pdfIn PDF document text
    • http://samocvet.org/foto/ck/files/jupagumogovebof.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///14467403615.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/51299154741.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/turuwifuze.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/64f39495c876cfe54e07131bc68a74d4/mawemor.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/7f5107123563e63be5f158529cfcfe35/likoduve.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/32119064978.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/16231728443.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/vefewobu.pdfIn PDF document text
    • https://qualitygums.com/userfiles/file/2691481454.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/fizekodesijafewoxe.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/fopewa.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/97716426656.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/20722440691.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/44099738011.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=drive+pdf+viewer+for+pcPDF 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_off0000d7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7ED 10188 bytes
SHA-256: e0721338d2bd2feabeaddc9e132a58cf628957589718311f2f2ab8f0883a28a8
font_01_sfnt_off0000eeda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDA 17940 bytes
SHA-256: 6d09abea79eb4e6233502f8c09f96e961149495b2366a6181ae68ce649ff8c57
font_02_sfnt_off00011d5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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