Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbd1e68f1dc59627…

MALICIOUS

PDF

98.2 KB Created: 2021-07-21 11:09:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9b2d4941e062ca0140c0925d61e52732 SHA-1: 8557d8491312c0b2a3cde8a8eb71add38fbc7d1b SHA-256: fbd1e68f1dc596277f3096fa2a92ba4ef752e112f3418a8adbc1995fe0849123
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It contains a link farm directing to multiple compromised WordPress sites, which in turn host more PDFs. This suggests a multi-stage attack, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070aaa2b5ba2---97783833318.pdf In PDF document text
    • https://macroedunet.com/userfiles/file/3902165040.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607100baf3fb1---6810775124.pdfIn PDF document text
    • http://moje-stranky.eu/userfiles/file/dimidapixiduxijutikem.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/2a95rdvhvq1d7dgl2etb4spbjm/88376274821.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b7f58f4d5---zoxelokaxuk.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/78119596618.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092d6d549082---tijefofobubidab.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/qmmv1ihkbp37tma0dd8ahdtgf0/98396930126.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/fewibiretisufizanonuz.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/1030572006.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/74821188906.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b82ebcc0d---1723294321.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/47cc5163aaa3904ecc629bd79cf58a3d/85771615192.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3219c36240---56602538979.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/nimiledeke.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a97aea91500---20231753400.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/bb345ea567671df95873095e29b1dfc6/tinajerasunidur.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089fc7e2fabe---17929587403.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095cc0405dd7---7513330645.pdfIn PDF document text
    • https://soechi.id/userfiles/file/wofidedugapeg.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/39410402668.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608412fd09b9a---15410858778.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/45494440153.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/53l7iuldi0jjd9d5bvl9etgbjp/mogokenididamegenofesi.pdfIn PDF document text
    • http://goref.ru/files/file/pumeseginikal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=the+pressure+exerted+by+an+ideal+gas+is+of+the+kinetic+energy+of+all+the+molecules+contained+in+a+unit+volume+of+gasPDF 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_off00011592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11592 18384 bytes
SHA-256: 795f5b8cd584de1ae5351c58d8dabe564c98590fdca36287eaf4e89dfc846785
font_01_sfnt_off00014679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14679 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015e90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E90 11644 bytes
SHA-256: 5bf3fd97dd4cb1448a6cedaa0a327e2664854d26c1e05a8e318a207b58544d75