Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf5eaec0f352ca46…

MALICIOUS

PDF

99.8 KB Created: 2021-07-03 04:58:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 50e6d650da0a9d81dbac9aff842c415b SHA-1: 76ac7a103260ae6494d0351c01b691df1b072208 SHA-256: bf5eaec0f352ca46dbca04935462a3380919a01786f81e9f2a22d1fc25c8f186
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised WordPress sites, likely serving as a phishing lure. The PDF structure and embedded URLs suggest an attempt to redirect users to malicious or phishing content, aligning with T1566.001 (Spearphishing Attachment) as a potential initial access vector. No scripts were extracted, but the PDF's nature suggests it exploits PDF vulnerabilities or relies on user interaction to trigger the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://krisoc.ru/uplcv?utm_term=sketchable+surface+pro PDF link annotation
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16095fd567942d---64079221249.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082cbdcc5260---vagigagavegovokumomov.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/90143376548.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/dokazivi.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cae3f79087---24284197974.pdfIn PDF document text
    • http://inistor.com/ufiles/files/60836437488.pdfIn PDF document text
    • http://nakatka.com/files/file/74925147121.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/83bb905836ed985b9a8101a9fec0817e/27320505021.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/23210078793.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddcd66522cd---8468185971.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/wibuzojiganuguzirubub.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/lentqt8qdkhaht09p4fqlp5394/nokewurujorisa.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdb4b0e2a1---58106405159.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b3500234d84---56301951726.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a26a20883d0---ludewapiruritepe.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/jofelibefudunase.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/wixuwelezofev.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/pumonux.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/07b69c65b30af0cc391739172434e0aa/rokewurarenemexoroferife.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160831b5c21fce---98699413943.pdfIn PDF document text
    • http://xinyuemu.net/assets/202106/files/20210612054612956123.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_off000122af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013ac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AC6 10788 bytes
SHA-256: b0ca343411500ad90eb95ccaefb740b74455489e5584f0ff74a133d94e0c0c7a
font_02_sfnt_off0001538f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1538F 17708 bytes
SHA-256: df5a62858e4b14b0a5b7fc48fa37d942167615ad0bb124eebfdc700b7f49e4e3

Open this report in the interactive analyzer, or submit your own file for analysis.