Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b512a373225fc99…

MALICIOUS

PDF

88.6 KB Created: 2021-09-01 02:50:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: efbd09e8a264af8f56878e3a7ea6da50 SHA-1: a49db37206c88d4644392b12ed9e8a64eea7f7e0 SHA-256: 7b512a373225fc99b8690c4eaa33d61548143753857a0defea76cda0c773c4e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/b50a6fce1ba0988fda026b422db33f66/62125357445.pdf In PDF document text
    • http://thegioicamdo.com/upload/files/rapamasinurejidularenezu.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/tatanuso.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/31983780193.pdfIn PDF document text
    • http://nbkhjc.com/uploads/202108/file/2108092243546802120gimcb3fnz32.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///sisapawifetuje.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/dafelowakoxojavixajiv.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/b02jlt21jdte1kvf0p090e7ba2/48340851467.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114a9fc3f6c0---tidunelo.pdfIn PDF document text
    • http://theettiaresmontreal.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/24106926971.pdfIn PDF document text
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/760f2c0165c07bd723503e1b028c54e4/natedebodupovutuz.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/bazusanifukopubivujirideb.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16102d81114bbb---kulogesowezopewifisamer.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/dufozisenaj.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5252f0a50---webejamepodika.pdfIn PDF document text
    • http://24cvety.ru/upload/files/gesafuxanafufiso.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/78bf65d0d043362300ad760fa5a017b7/miwedatijizabuxafes.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/basavazakekamasa.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/89024088478.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/64079224179.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5302813556---53152782942.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f1342e1b4---64381044344.pdfIn PDF document text
    • http://aahsclassof1978.com/clients/b/b6/b6117739535924054831d33ecd54b00a/File/31366555201.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/81863601575.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=anterior+and+posterior+cruciate+ligamentsPDF 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_off0000f394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF394 10940 bytes
SHA-256: e30d6d741cbe47e3fd7b467ec5ad7d50ddbb0f226958242532d0dff459618a20
font_01_sfnt_off00010cb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB7 17876 bytes
SHA-256: ea8501b71b44498939d91bb1f134fbbf422366c3ee2070d9c3bada5b97d8a4b3
font_02_sfnt_off00013b79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1