Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c5c6dab13ce3775…

MALICIOUS

PDF

77.3 KB Created: 2021-08-12 16:47:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: ead9801e7e934b2568810643cea74638 SHA-1: 4130888796b1e78332103084d05664933778b0d3 SHA-256: 8c5c6dab13ce3775eeae5cf2f27ffbefa1ea1fd698ad7477df2e7e7cef223662
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the document being a link farm, with many embedded URIs directing to compromised WordPress upload directories. These links likely serve as a distribution point for further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e31c6d3bac6---94390128872.pdf In PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160e17c282472b---pagumafiliwabesev.pdfPDF link annotation
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908c727b725---rulowapezabudasudepa.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c333cf5ee6c---45395808241.pdfIn PDF document text
    • https://dolphinsolutions.net/ckfinder/userfiles/files/nitubumofifojozujasovuxo.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/35294019542.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce3165d4df4---ribefijatus.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/88542067431.pdfIn PDF document text
    • http://www.odnpoznan.pl/fotki/file/file/sitelelop.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/1vkpevn99ap33asgt8jtg0jbqh/50100862985.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e707b77fda---33451273393.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/72018417405.pdfIn PDF document text
    • https://adikkeempat.com/contents//files/84690907123.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/67775117832.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77620392167.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/nevupavegobemadef.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cccaa013eb---povulotidobopej.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160b4701459cae---ruxulapipetibaxipoxaroma.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a896c550ab2---73136615966.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee89904d38e---86993863395.pdfIn PDF document text
    • http://smclassof57.org/clients/34860/File/tonotosubisusiv.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/ronog.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/kixitiwexir.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/lucgap4absi2g52l9d4vg1j762/45526545102.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=saltwater+fish+identification+chart+pdf+nswPDF 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_off0000ca17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e22e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22E 10880 bytes
SHA-256: d450687ddb0d4d17a3cf0c3a016d0f5d9333f00b5a3ddf3f358374395967329a
font_02_sfnt_off0000fb49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB49 16228 bytes
SHA-256: f59590237c51c0682e7940dd88b43debb6a03a59dd643efd0129d008e294b204

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