Malicious PDF — malware analysis report

Static analysis result for SHA-256 92f2cec085f38c37…

MALICIOUS

PDF

82.7 KB Created: 2021-09-11 20:10:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9fa6303cc69a6b15ee9338e74636444a SHA-1: ad493950f1336cdb25062b091c2c3cbeab5332f1 SHA-256: 92f2cec085f38c3786eed959f8c54bf6af54c40b34f8b5797842ebfb8ffa1719
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on compromised WordPress sites, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the nature of the link farm implies a phishing or redirection attack, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/a9cahokt8ueoj1om8916v19cmo/tagukujekobawodu.pdf In PDF document text
    • http://seritour.com/rsm/files/pekatenevef.pdfIn PDF document text
    • http://molenat-energies.fr/molenat.com/images/editor/file/biperemofixovexi.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/teborubimigukewiwowowav.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/xibedasujarelogewejafo.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/jilifinir.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/15726762559.pdfIn PDF document text
    • https://polandpools.com/contents/files/87120846835.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/jakenedaxexawadaxatura.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/xoxogotivaporadizi.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/cc85bad7e38c32b50800228973294b32/dafibefavarejamemaminap.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/10549281946.pdfIn PDF document text
    • https://makenie.com/upload/files/gubenozatukezizameviba.pdfIn PDF document text
    • http://odumakus.com/uploads/files/48042756607.pdfIn PDF document text
    • https://udruga-invalida.hr/files/ritirokafiz.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/mudusijiwunuzuxogamadup.pdfIn PDF document text
    • https://akvanova.ru/sites/default/files/53386956697.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135bec2be46d---tuvatudusiwam.pdfIn PDF document text
    • https://xn--23-6kci4asohe8k.xn--p1ai/userfiles/file/30688981398.pdfIn PDF document text
    • http://dylogistics.com/userData/board/file/20742133311.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/xarup.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/10263975288.pdfIn PDF document text
    • https://otterdisplay.com/userfiles/file/72903463904.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/28521327619.pdfIn PDF document text
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/2738509785.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/87604887021.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=planets+name+in+sequencePDF 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_off0000db08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f31a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31A 19540 bytes
SHA-256: dc897c95665ea923f4feeae9a551a61482cf88bb1003383a209ff4321b3d9c3a
font_02_sfnt_off000125da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DA 10420 bytes
SHA-256: ade628ddec1eebfbcc615c00b65f1fb4c9525ea6e89d500382414e8969b3a389

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