Malicious PDF — malware analysis report

Static analysis result for SHA-256 a474c2a7c697c88b…

MALICIOUS

PDF

81.8 KB Created: 2021-09-03 03:43:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 82c9f8647ac25e3496755e0605983437 SHA-1: 6a54bccc8176f8fd03a97372cb9fa1810d6d0b2b SHA-256: a474c2a7c697c88b5535395f63e851392c271410a351ad3fe8543be2f08b39f4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous URLs pointing to compromised websites and disposable hosting, suggesting it's designed to redirect users to phishing sites or download further malicious content. The presence of embedded JavaScript (T1059.007) and the overall structure point towards exploitation for client execution (T1203), likely delivered via spearphishing attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=norma+iso+26000+pdf+colombia PDF link annotation
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160870fcc76664---romagumupurabepiranixetul.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/40463500297.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16094a2aadec65---sugonixu.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f9ebd4f5c---makobewut.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/files/rigifadenuwiziramofib.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/jb9h9j6adh1cbvaomlvh46mu16/kasixidorefiginugutave.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/73208091738.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b6b141a01---7183442236.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e2140521b---lutupatatesolif.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/3jmf7gu0u1p74fh7klr72os88e/3597714249.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/a4ca5d811d2c7f88d9df370de25d14fa/82931601335.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/h383k20hcasbsfk2sgeoq1gm7r/rovijebokezoma.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/vedomepafiboxiratililebi.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xivizerila.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160727e980b5ef---10563399923.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/90801695057.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/6267837155.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/jevomeroxebo.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/b0f49fc83af93d249c30fbd07476b972/39536981348.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/clfd7rdt3k6ieo2kg3gur61inb/52450318460.pdfIn PDF document text
    • https://luminex.pl/upload/file/sezonotevupevefotur.pdfIn PDF document text
    • https://groupunsur1.com/contents//files/70184805245.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/guwujovufefuzarujebaz.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/ribitovomag.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b2db72db83---74753240675.pdfIn PDF document text
    • http://hnsunnyfood.com/d/files/80128486145.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_off0000d7d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEB 10976 bytes
SHA-256: 9fff85ee2cca03965e7626e508804921a419c7806883e15e1acdfc76e04414cd
font_02_sfnt_off0001092b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092B 18680 bytes
SHA-256: 10570267bb2d2b5a7cac64e8a157b1a8ae7d6e3bee9de2e25fcf80afdf190357

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