Malicious PDF — malware analysis report

Static analysis result for SHA-256 7064c6dbfc7eb14f…

MALICIOUS

PDF

100.1 KB Created: 2021-09-03 11:32:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 390d3cb699cd9ddc0c503093464f9313 SHA-1: 20e4990efb7d5080648b12a56c97c6f58467e4c6 SHA-256: 7064c6dbfc7eb14f25703f41de0b8346b443fddd01e85c7a31d06cab2e763756
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of external URIs and link farm heuristics supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://shengnabei.com/uploadfile/file///2021061502591128.pdf In PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160db859044d25---vuviterezazeviwo.pdfIn PDF document text
    • http://gialtour.it/themes/userfiles//files/sisaxo.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/an9llqq6m2g75j5iq3mbg3cc72/reserubimademufaxodi.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608371418dd1a---53742472382.pdfIn PDF document text
    • http://hopkins1983.com/clients/861771/File/tupulezojojo.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/fulujo.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/21716207534.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/jogevuguxuxunilumipunal.pdfIn PDF document text
    • http://ahchala.com/img/file/merimusivonirofo.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/gawuboxonu.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/92786396112.pdfIn PDF document text
    • https://lncl.org/ckfinder/userfiles/files/zunodomapawopuvolujemapo.pdfIn PDF document text
    • http://cjmjwarrickhudsonfamilyreunion.com/clients/9/9b/9be434dcd9982d5451de1b36a82eb828/File/67501303484.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/wofaxuxedezuxenizarivi.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/6675a46a3cfeda5737ab4a418cb15259/79823423382.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/79096558347.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160aead53c1a27---64703872880.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f88f2da898---goxalegom.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca65cbb221---sarojigelulomakazibofiko.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/62531436955.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/ruloguvali.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/dd68a37a10f6f1f745eed587dc362b18/42666339583.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=italo+calvino+the+distance+of+the+moon+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_off00011d77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D77 10804 bytes
SHA-256: a8823ec1ba5e605888abcd62ab62f1141468c2b6ab5f11685c074c8d76838b9f
font_01_sfnt_off00013628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13628 19932 bytes
SHA-256: b1ad9bcf0b38779794e1312a12d9d8358071dd5ee66e143f841ca40a14e79817
font_02_sfnt_off00016a57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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