Malicious PDF — malware analysis report

Static analysis result for SHA-256 171f2fac54eb3528…

MALICIOUS

PDF

90.5 KB Created: 2021-07-29 09:21:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 209fa94981a11c6c39a950b2b13f0a21 SHA-1: 2db580989bd5b755795b33481ff64356b524138f SHA-256: 171f2fac54eb352895e432244679f341b7b8d9e2af430f63d7eb95651d39fdef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress upload directories and disposable hosting sites. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest it is designed to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/0mpu9ns0oc23acd7bnc9811qqa/kudusikitole.pdf In PDF document text
    • https://ceccarbotosani.ro/userfiles/file/62482687447.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16079d74617382---33893179115.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba225d1f79e---xenawaredekige.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/dipodapabosolusogalapaxaw.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/dibakafifewe.pdfIn PDF document text
    • http://mujuerp.com/uploads/ckeditor/files/20210526205320.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1007d00ca9---36493216499.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc2ce0884c---58308906808.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/vajujid.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/banarew.pdfIn PDF document text
    • http://karunb.com/UpLoads/files/wuzulibewobijog.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210603110303.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e65fe07c805---66209373394.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a80c8c46ae---zeguvupekonapapagisol.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/g37v43ld18jje4k08ivlgom2k6/55756158059.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/zasaxiwesovef.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///72051221708.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/5p9pr54ldeanovjghmqbn2qca6/rupakalabuvimatol.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608352cb7adbf---vajezivuz.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/efe55203f46ae7979bec738d6d580c5c/gekutax.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/necd800sdep3bko5rice6s33uf/buvilugu.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/dg9l0dh8sagrusu8vu651j9uoj/71919195827.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/94381601457.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/78862731981.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+get+pvc+aadhar+cardPDF 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_off0000febc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000116ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116CE 17132 bytes
SHA-256: fc48c3a6bdc60c68481486d072c7d4025b50bd98dbf1ddebc8604c8d35d218c8
font_02_sfnt_off00014379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14379 10524 bytes
SHA-256: 5c7c808e682cb7b1e79b54c19f3e4128a608af7a7eaface2e59d0aa698a7ad61

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