Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ff3945dcbab1997…

MALICIOUS

PDF

90.2 KB Created: 2021-08-11 04:15:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6022b293232af6773611c38db3f30998 SHA-1: 1ce70f7b36876810444161940b7d748e55542095 SHA-256: 0ff3945dcbab1997c85d322743f4000474bb1228b944b4a5ba1a55dcd5c246b2
164 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised CMS uploads and disposable hosting sites, likely to download further payloads. The 'SE_INVOICE_LURE' heuristic suggests the document's content is designed to trick users into clicking malicious links by impersonating an invoice or payment request.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://defi128.com/userfiles/files/novadixubumakugizorenatol.pdf In PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/pujopexaxuwituwabebomuref.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/vevewilabeveleni.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/bepifuzogumolitosafo.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/81426243094.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/bosat.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/99221560541.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/pibetegamomebebujavijosu.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/54934479017.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/92435658425.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/c2a142e77552e9b36a4ce5974b3c2127/penefibumazopilugonasi.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e6c2f93ba05---pigepamow.pdfIn PDF document text
    • http://cdhsalumni.com/clients/28864/File/zasifabawilokirid.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/81067058068.pdfIn PDF document text
    • https://mmszke.hu/files/file/18062217448.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/tisakejajisomofakifube.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa117974318---31220363217.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e93ab13f792---13536282513.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/de5411c7c501d2943d5842c8161ad8af/11436460133.pdfIn PDF document text
    • https://hirurgija.me//files/14765125722.pdfIn PDF document text
    • http://headrepublic.pl/images/files/70381762181.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/35983320699.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=az+corporation+commission+annual+report+formsPDF 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_off0000fb92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000113a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A9 10784 bytes
SHA-256: 8c3fd4bab4f17c4fd2a55e7d9634731ef5c338f35ae24e282c568bdf0b400880
font_02_sfnt_off00012c8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C8B 16976 bytes
SHA-256: 7f6fa618913f2a0b8fc25161adcce7387f04dff95f588289592fb980785c820d

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