Malicious PDF — malware analysis report

Static analysis result for SHA-256 43dd07aa5b653176…

MALICIOUS

PDF

83.5 KB Created: 2021-09-17 03:11:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 27807dd7939b27b876ef8a4022f8b08b SHA-1: 1ad63053afbba9ae14f729f8efd2dbc3f0c3ca22 SHA-256: 43dd07aa5b6531763fa1eb66e1b7008a76921596e61d17403655f84c446d7b9e
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1534 Steal or Modify Data

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. Heuristics indicate it contains a link farm and a lure for MFA or one-time code harvesting, suggesting an attempt to steal credentials or session tokens. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://wastran.ru/uplcv?utm_term=miui+12+update+redmi+note+9s PDF link annotation
    • https://sonntag-immobilien.lu/userfiles/files/nibusexomiguwin.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/69333610883.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210906_045632.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/19028610106.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614175b69ef21---21811482021.pdfIn PDF document text
    • http://nfc.soo.jp/file/delinuvijadaraxasadikux.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/pakozatuwawokadivopevuxuv.pdfIn PDF document text
    • http://saint-party.com/media/file/funefedu.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/faretozajevu.pdfIn PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/xuvibesi.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/ofhnh10n9ip6cca5cgah924ei1/65130314738.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/22062665573.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/76472978828.pdfIn PDF document text
    • https://hkki.org/userfiles/files/mededukoxesupodimakuj.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/21751305747.pdfIn PDF document text
    • https://qfse.co/images/uploaded_files/ckfinder/files/1631589579_ce265fe047.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/jasowebuxidokipofo.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/28894634502.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/32838216424.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/30972229080.pdfIn PDF document text
    • http://hotel-gerard-dalsace.com/upload/document/sofagarimesenedigula.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/sopigojeg.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/aqteao9dnmig7h9dpp7tbrtqs0/30855073756.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/penupuromof.pdfIn PDF document text
    • https://b2cdemo.tickets.com/content/files/vitenogosexilemonop.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_off0000dc97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC97 10940 bytes
SHA-256: 0dd9913a30c79949308c675ed38c5c6c54da6e01e9eed0fa97d007f5ac15c57d
font_01_sfnt_off0000f603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF603 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E15 18912 bytes
SHA-256: 6d266cc53420a282432fcfa8e45fdbb0ad29db5855a150def97b9a96659ac850

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