Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f237a41943edf31…

MALICIOUS

PDF

77.9 KB Created: 2021-09-06 15:49:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2df7225eaeb7b54eb12fa066064622fb SHA-1: df2a32b6fb14d59c7d2b9a9ce4660a281ee958fa SHA-256: 7f237a41943edf311979a6f92a6fb2338b7422125e05b3d6e0f8d45ece2f2110
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document structure and URL patterns are consistent with a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://laborke.ru/uplcv?utm_term=que+es+pantomima+pdf PDF link annotation
    • http://molenat-energies.fr/molenat.com/images/editor/file/22929366071.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136075aa753f---9362081306.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/1446692586609cb6ddad0cf.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/guratedo.pdfIn PDF document text
    • https://kompaspt1.com/contents//files/50483952733.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/57268826309.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/luzusobeban.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/s470gi30sqoajqt1cv406f3cjl/67713436018.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d53c4d50c26---24972058022.pdfIn PDF document text
    • http://cycling-software.com/files/file/vozolopezofoleboxofisida.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/68664874093.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/mowademozuwaje.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff15c5659c---pidibugiraw.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160750c0e624bd---10928155566.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddef1107fc---dofumifetiwonotuxazokusin.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/4defaa985863cac6b41e43f18993e141/gabisub.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/85299812326.pdfIn PDF document text
    • https://windsbs.biz/files/file/76454523644.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/97861009521.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/gc7jgome2hsv8fhupfv9frhdjm/lajaxada.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/8675002912.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/toligitogobirupitetiw.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/lowepisujojizifilerajaru.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/bilojefibetizemafuwo.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/bujokevazukasamo.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_off0000c6e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E9 19916 bytes
SHA-256: 62c78315bffbf906c6dc8473f0e1530183b7299a17149664596ee7d645d4fb45
font_01_sfnt_off0000f946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF946 10672 bytes
SHA-256: c409fd1ee7356edf24f9475e2af0144a506c428433c138c30cd4cd57377f3142
font_02_sfnt_off000111d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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