Malicious PDF — malware analysis report

Static analysis result for SHA-256 789f92cd783b2342…

MALICIOUS

PDF

69.9 KB Created: 2021-09-04 06:50:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4a904394c7219e00478a0b9a49f98ccb SHA-1: 61da6af121662899c488002a2e542ad0cbdc49b2 SHA-256: 789f92cd783b2342e10bd6a7bb16e7df8e702e8ce2e8d4a071b8bb3c5b12fdab
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised CMS uploads and disposable hosting, indicative of a link farm designed to redirect users to malicious sites. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of numerous links suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://lokalsport.no/userfiles/file/jowope.pdf In PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/fimaroxadevini.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/vivubawot.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/zibadogesuna.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/49624513637.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16076a03099ce3---vupogadetuxid.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/n3heroafoflggaa7vtq5ovo7gq/34847304131.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/31398535763.pdfIn PDF document text
    • http://cga82.com/admin/File/befopaxavogegapenoxi.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/934a39898862cfbbe0bd1478b8bbe2bd/29113525991.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/dekanineli.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160892d0a71d80---14737727347.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160732ec8d0369---vatobazedofolekag.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/rorajasokifoburuzim.pdfIn PDF document text
    • http://whs1963.com/clients/7/75/758a827d59fb1c2827eec60421ffdc22/File/21680127654.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/f86e8960c9d73181a0fc5e83739d059b/fikasubimemubavasobuv.pdfIn PDF document text
    • https://ratosatu.com/contents/files/rudononasalugew.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/51149351210.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/51890198429.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210802_6ECD6EB4E8FBD1AF.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609f61ff6cfa3---wafabadujefenemozoro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=rlc+circuit+derivation+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_off0000b1ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1EF 10656 bytes
SHA-256: 56ee168a994d3b80193e7a2cca2a70d8064d553406d4dc88138210f9a2f006e8
font_01_sfnt_off0000ca76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE288 15620 bytes
SHA-256: ed6ca9db6bd0a0d2190bc5cc17c8581516b131f18ec9ea8f45a93f8bfb052039

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