Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c1dac71ae2bdeb5…

MALICIOUS

PDF

76.3 KB Created: 2021-09-01 09:47:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d8444ba8d8da204049d6d7584c7634f2 SHA-1: bcc619b7a9510a5324b0897c8d5b1b8744f18275 SHA-256: 7c1dac71ae2bdeb5c6e06b2c531cd6675d24a5ed783a4c217db8de99b356fcc5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or scam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely used as a lure in a spearphishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://synerhu.ru/uplcv?utm_term=your+works+are+as+filthy+rags PDF link annotation
    • http://vipnjl.com/userfiles/files/62534656151.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/88315194875.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d21dd4be4f---ripob.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1609883ec66684---33763930905.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/mimosuduletewenenomuwawod.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/72890376152.pdfIn PDF document text
    • http://gospelpour100voix.com/fichiers/newsletter/file/95270029808.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a29b96b0322---namesemuxusukuletuwonenit.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/9f5b3deccf5a2702a88405e29dae101c/timudikojopod.pdfIn PDF document text
    • http://cherishedmomentphotos.com/clients/8/84/84fe84b553acfcd191e166b7401b6f02/File/negoxavorakozolokexuwager.pdfIn PDF document text
    • https://nadamasristorante.it/file/sovuwewipekowigana.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a906d570db0---rikemur.pdfIn PDF document text
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/11584909863.pdfIn PDF document text
    • http://nensi.si/upload/file/51768233902.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/4ec1617996903a736f0febe7ddf9f2d1/65518445042.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/135030392707928eac693c5407ab0f9f/fujugesugil.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c778fd668e3---25252721921.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/rolipiligokaw.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/figakemejorib.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/kabos.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/24775698423.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/damilo.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8f85242d8---ritovab.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_off0000c7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE8 16428 bytes
SHA-256: 76219ea7eda108403d0ed855ba4a2429a4e6762a386c42416715652b818c9a34
font_02_sfnt_off000109ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EF 10764 bytes
SHA-256: c3eedaf0fc3435f41cb934aea62f77aaba053adddddd6a98fb5f095fa9ddc101

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