Malicious PDF — malware analysis report

Static analysis result for SHA-256 9197fd2376970d31…

MALICIOUS

PDF

85.4 KB Created: 2021-09-17 03:37:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ee7c74c537500ccbcb9366d1b8e9d219 SHA-1: 09fbeb8a8ad8115a224d9eb840eb09a1f0f01fed SHA-256: 9197fd2376970d319cd0d9af38cd08559918d7225e409361d271335ff732b3e5
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier. It contains numerous embedded URIs, including one pointing to a raw IP address, and several links to compromised CMS upload storage and disposable hosting. These indicators suggest the PDF is intended to redirect users to malicious websites, likely for phishing or to download further malware. No scripts were extracted, but the PDF structure and URI patterns are strongly indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://tt-ural.su/admin/ckfinder/userfiles/files/gitilopatidu.pdf In PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/63559433348.pdfIn PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/5108396504.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139346db822c---bidugufuposovu.pdfIn PDF document text
    • http://med-os.com/user_upload/file/doguweme.pdfIn PDF document text
    • http://vhshf.de/File/66668499373.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/45014917983.pdfIn PDF document text
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/bogonarizazi.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/96275907850.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/zibufu.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/c4c95d92caec2ad1ae39c53756706e7c/tanofevilexevededuvurino.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/6490645420.pdfPDF link annotation
    • https://windfreeklima.com/upload/ckfinder/files/nenepujorekufezokobodov.pdfIn PDF document text
    • https://yellowstonewildlife.com/wexosir.pdfIn PDF document text
    • https://nedimgame.com/calisma2/files/uploads/kobofuzakagekesidam.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/9880429809.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/23610032591.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-06-07-59-40-42.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/65018598683.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/xelevopenubanopigaxinil.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/zurubowaduxes.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613444f008811---19571354739.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/18033483128.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=chemistry+lab+equipment+drawingPDF 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_off0000e6b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B6 11336 bytes
SHA-256: 105cde18bbb1db64ffb576916e5113d929e0ddb5877d4b13253095fc5349e80c
font_01_sfnt_off0001008a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008A 18400 bytes
SHA-256: f6d4a6d1d8e5cb739343a0fac41ae22185d327a0d3223bbbae9266d1e16dc529
font_02_sfnt_off00012f9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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