Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8f15fd88822b214…

MALICIOUS

PDF

80.7 KB Created: 2021-09-01 00:12:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 483299d84ea6b1b90c519fc5b3af1109 SHA-1: e71b37d43a626011585443fd543f581580757d63 SHA-256: c8f15fd88822b214879530fb7ea283bf8cbed096e01244b68a812fbf037088e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of link farm heuristics suggests the primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://kochamsushi.pl/UserFiles/file/20751728980.pdf In PDF document text
    • http://cipetbhopal.com/webimg/files/nuruxatufepaliroti.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160b616935205b---14463817587.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/mobamiwa.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a43c54346de---moturo.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/ht6cd431vjpvrishn12si24elj/27651524839.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/9d88a79846c0c0b49c59b83037a2f125/33828406946.pdfIn PDF document text
    • https://peterdegendt.be/file/runajuzukojifikajo.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161111803be87b---lazidifodimusuzeso.pdfIn PDF document text
    • http://m2m2design.com/userfiles/tijinabapurolibenobepiso.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/0631aec82a2ebb48064ac479b34dff2d/zokiguzavigazikibanilugik.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/62663576413.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/06c8859cbb49151b51ab49fe473718d3/vofefivelivukukivuset.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210705083310.pdfIn PDF document text
    • http://sdds.be/userfiles/file/68595523606.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/6e7204540e0ec54f648e0ecb16ed7946/65464618821.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/20057242636.pdfIn PDF document text
    • http://www.optimizecost.com/admin/ficheros_fckedit_subidos/dotexunokonub.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/61713438859.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/e11e1ff631e3124a1495d6ae645584c2/75944241622.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad507d68a8---52383359820.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/nijawunonenuzokotajunewa.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/1957ad86a1ce1a2245c8e06fa1700ca9/wamokivubaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=cheat+recall+mobile+legendPDF 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_off0000d7f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF008 10820 bytes
SHA-256: 07d7ccf172e71795bad5b9febc09a0f3276f68188ecfa596797a74bf7ba59cbe
font_02_sfnt_off0001088b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088B 17260 bytes
SHA-256: d1bbb3b8a82dcb323a0ed2c2075b3410cbea312f88d9268624ef372f8841ff98

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