Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6806707bf6a0406…

MALICIOUS

PDF

84.4 KB Created: 2021-07-14 07:07:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8c2afa520acc07d9a74b8443f94ec1c7 SHA-1: cebdaddad69a73044cf356878e8a22b6aba72d50 SHA-256: f6806707bf6a04061ebd9a2b17cce0e617924651040572084f06a7685968fa2e
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 uploads or disposable hosting. The ML classifier and ClamAV strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, preventing a more specific assessment of the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9834

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://casinodanmarkjackpot.dk/userfiles/file/34491290954.pdf In PDF document text
    • http://www.urbanwaterways.info/files/77627661489.pdfIn PDF document text
    • https://avela.md/userfiles/file/funefafunetepomalapo.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096874fa1190---dawijup.pdfIn PDF document text
    • http://thecoferfamily.com/clients/7/78/7892d776c92a08c80f86ebc6236678d2/File/melozipawo.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/maxadisake.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/saxoxofereseno.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/3b4a61c5d89f20c81fc44e964c09b20a/95955198985.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb21b0a3d6---gevovulobe.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a575f5a9593---14013106244.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/dejakekoxagakaxejog.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/xunos.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/kolunabezifazibulezike.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/h80u7cq31ua7pco4f2c0595ji8/52317851701.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b358be6c79f---kepazekedoxafewu.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/b03ui24kekl54qms6u4fmnim1c/rarumuxejedigowozumever.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160be373bb852d---52580904998.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608377d109c0a---kixejesawuvimi.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/004c4eab9fe10f40fbaac23098097ac1/wobateneda.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/43944649351.pdfIn PDF document text
    • https://bdsvieclam.com/upload/files/82194177556.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/82r1bmvi46gp3omgo83fmoelno/33930330014.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/nujabokikudasuzarumik.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16080e2a6e1e06---64152691680.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c22605825df---powokaro.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/tizekegizarofa.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a350fc0c088---79424897698.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=the+teacher+from+the+black+lagoon+pdfPDF 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_off0000ded4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED4 11000 bytes
SHA-256: f58743df44929bbcdeff58b73c37560b4383bd2338589d4b10b971438fe446e7
font_01_sfnt_off0000f7c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C1 19652 bytes
SHA-256: 31dc4ffb0519ac8dab8c3de80723718a9b0b3869808b90b7cfe0baf766079c0f
font_02_sfnt_off00012a3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1