Malicious PDF — malware analysis report

Static analysis result for SHA-256 972105f639c37972…

MALICIOUS

PDF

85.4 KB Created: 2021-08-23 16:01:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 691b356da14e2bd8e7e73ce598b8dfb3 SHA-1: 1c2c542f33bb2e29bbee805681e839aa723bce53 SHA-256: 972105f639c37972b25b16f6280446c66f7e9b0741366ddc2af537b8c1e933df
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. It functions as a link farm, containing numerous URLs that point to external websites, some of which are hosted on compromised CMS platforms. The presence of these links suggests the document is designed to lure users to potentially malicious sites, possibly for phishing or to download further malware. No scripts were extracted, but the overall structure and URL distribution are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://wastran.ru/uplcv?utm_term=how+to+read+a+scale+ruler+1+50 PDF link annotation
    • http://alpha-cp.com/userfiles/file/18934116115.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/vofupuwuwufuwewonijabufo.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ffa0963dc3f---bivinetateduviragaso.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/52669102941.pdfIn PDF document text
    • http://ghhs1968.com/clients/5/57/5762190d0a265df614d1f295a7060a42/File/35519912893.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/vavegokefibim.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/479b26fab311632e110cca7674b1ee01/69320306294.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/tt7mdgurma4283i6rl0ukrk56c/fitepurabipexobod.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/vajilivixizore.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160acd453b8752---88859828815.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/uc3hkq693cd0lo2a738ev8n139/67658614201.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16078c1c92a8ba---foneroliporulazis.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/4fd52c6fb9a186b538895e8f2b0fdea6/89458102923.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160cfac52cc6f8---lepimilosuwexugubev.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16078c2428c512---jiviravisepubipi.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/51948043652.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/s1930o8i35b0t7u7bpdg16nk2k/89056261941.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/9603038534.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160d6f64d8d99f---xoboxewalejojelupak.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c2bce7d3280---gupagikiruzojufexu.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f440bac7296---21142624832.pdfIn PDF document text
    • http://palami.by/images/file/domepe.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/pafegozipowikusu.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/vimexolotajeg.pdfIn PDF document text
    • 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_off0000ea83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA83 10652 bytes
SHA-256: abb27d3da3a83d6920b26ffa5aaefd4bb1ea6ba1e3c1b2f10374214fcb24ff7f
font_01_sfnt_off0001032e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032E 17072 bytes
SHA-256: f1e6d41abbdba5d711275838db0940cad523fd2dbb36c521910d62d52166fbf1
font_02_sfnt_off00012f6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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