Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9c6a0930a2142ab…

MALICIOUS

PDF

96.3 KB Created: 2021-07-22 06:54:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: c8a3f3fd7815baded2f62449f4794388 SHA-1: 8cf20dd43b06134038f9de2cc374ad519f3450b7 SHA-256: a9c6a0930a2142ab3c46e63229485d006ae7702130167c5d3a8e9f2d5a603019
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised CMS upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9486

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://digitaldaya.com/imagenes/file/9588327811.pdf In PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af83837707f---42026890857.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/35507204584e51bebb52bffb10d3cdee/41207876579.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/sijugisolijabexu.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/porigajapus.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16073c20396f35---tafidunibotisinewavujo.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbe44d4ab8---6715708975.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/rikoj.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/85196430595.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a580387b2a8---633966743.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2200c557b---rilefujid.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086cc94ef6a6---80829303470.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/lpc08oir4t1bckurubdka9v1c4/vudorevebodizafovija.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/cg7jp1d2k1lqo63e1jv19uka7b/61577850195.pdfIn PDF document text
    • http://hubbardfamilycircle.com/clients/62940/File/zijenodisegejigoni.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/56065174349.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e317b4806---19447556353.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/fevobukufudofet.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819aebdb63b---nurejaxiwagukimidiro.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/68061684264.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/hs7uk2bds6nmkgntajfdesa8c5/bupesurulefujadejew.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e54cbc33db---nalizuganozigelaxemo.pdfIn PDF document text
    • http://apvn.info/userfiles/file/jarakosesogiji.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/s9m54h63uvo54ote0t4oelpmqi/mavixinoloterogizutafo.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/4ce5db09cd94ffdbf37db502f367c117/20291933761.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/zafuwuxinivugudex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=the+meaning+of+crankyPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000d3a5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xD3A5 19128 bytes
SHA-256: 1a1ba01399ec6dbfe0081c1432dff63a47db71b8690c8373fe0a88b60c380d2f
font_01_sfnt_off0000f41b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41B 4136 bytes
SHA-256: 6a63ffd39da05b5bfec4d94316909933ad77d87dae0db811f1fe4ad09d9a4157
font_02_sfnt_off000103a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A0 10640 bytes
SHA-256: 2f335b5d510d7abc926f86dbbc3b45568725e3a058c6d39c482358f003ca9d56
font_03_sfnt_off00011bca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off000133dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133DC 25104 bytes
SHA-256: 8d83e750934a2c89a86f2dd041813c24ba4df6d12e25020714cd6dd990efe840

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