Malicious PDF — malware analysis report

Static analysis result for SHA-256 84c0cdcc4b67b209…

MALICIOUS

PDF

92.0 KB Created: 2021-07-29 20:23:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: e040d2be2df34bcd161c097a8f53e9a8 SHA-1: 2c5364ec36e8455baeb133dc3377b861a8ddcd53 SHA-256: 84c0cdcc4b67b20902b38a1e16c993451adb41440d23f93587c554dd8f26eaa1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to websites hosted on compromised CMS platforms and disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports the assessment of a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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 http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/3145e5ab21bfd1dc126d46c8ed20eac0/89931165687.pdf In PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae5bf47236---5677680373.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/rizizigipanapaxim.pdfIn PDF document text
    • https://sayurmateng.com/contents//files/89587386100.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/motolagibivogupumejiz.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/miromaboje.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4337f51ead---mewiw.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160fa0414379e0---3838324528.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/46579217410.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609473996e427---putaxodezesidesizuniwepo.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/69911126341.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/010a413a6e18ffc146c111fb9ebb8d9f/10045123240.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/51371236274.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bad93155183---pepizevedanivaji.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ab670768f---42449658071.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bd66cc5c687---vetadifikekipinavogos.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607238f91531b---29889756049.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/jijasobokide.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5190cd484---supugebilibe.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/93102330591.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/jeminefikawovewu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b2ef8f813---wasoke.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/77069050025.pdfIn PDF document text
    • https://vigiweb.cl/dinamicos/files/file/wafaxopigamuxinut.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/itingk2j0pc0dn2m817bojj02k/pigogoratekitosisusim.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/43329466450.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+high+to+install+air+admittance+valvePDF 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_off0001047e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C95 10960 bytes
SHA-256: 5268e013684a5ad991ce85e72512bfde71c4153e15867c4f093db4b9b027c261
font_02_sfnt_off000135a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135A2 16552 bytes
SHA-256: 8738f920b23262a0b9a3200ae2cdf674f2e1700b429dd50f533b4fb90d8bed45