Malicious PDF — malware analysis report

Static analysis result for SHA-256 66875c8fa108dd8a…

MALICIOUS

PDF

79.6 KB Created: 2021-07-06 05:42:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2c80db57fed6d085ab791881e5e9c18b SHA-1: 396f1e9697abdc5feb1c77026f23f94059e74412 SHA-256: 66875c8fa108dd8a4508bd06d91d577fbb5a78e5ffbfaea996235162ed4ece91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous links to external websites, many of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The embedded links suggest the document is part of a phishing campaign, likely attempting to redirect users to malicious sites for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/d2ed118ce45ca36ec6e49194b276c60c/volesiz.pdf In PDF document text
    • http://agendatourvietnam.com/hinhanh/file/39247824344.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/35883815992.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/7e7cc172f30bdeb9cb201838fb37b03a/36284089719.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/2tkaifa4n2kqqdbhf6d1c4j822/xavafinavoli.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/45k9sml129are1dfojm01bp3l6/taxodalipudibugipuwavazo.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/govododadobosa.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9f2fc9fdd---69796645235.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/13037203170.pdfIn PDF document text
    • http://nutrisoilvietnam.com/upload/files/10573481592.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4a7846a46---nupapijejuj.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/642b395cd3cc07f984b141d8e390c848/64025583602.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609619468bb5b---bavuxoxavumixaja.pdfIn PDF document text
    • http://planbmedia.hufiles/82440954566.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/u36rqpk5il50iljmilb1mv6uqb/13818237880.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/wazoterimexu.pdfIn PDF document text
    • https://banghenails.com/upload/file/xusogupupi.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e206a09d79---lakosufatavimolap.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609241f18e1aa---11389740883.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160748b83b0155---61205364950.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/12072352339.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/0u0og1iuqcdojpj5kkm59kp54m/lusoxibijotebijozonibe.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c93ec4b082c---limuradoxamivuvobevekirab.pdfIn PDF document text
    • http://schokobrunnen.com/idata/52142765058.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2764d184e9---gerurumiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=change+font+fill+and+sign+pdfPDF 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_off0000d531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD531 16720 bytes
SHA-256: 1dc15306577853cf5ec55f7eaef1116e6a6978f7022b8815b7d1e7813cb01477
font_01_sfnt_off000100b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B3 10708 bytes
SHA-256: 665abbeeea1256d4edd1ea1205848ece1595545fea7b33abc75ecf2e6d637c4a
font_02_sfnt_off00011909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11909 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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