Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea7a087464d8c9d1…

MALICIOUS

PDF

82.2 KB Created: 2021-09-03 08:11:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b7a7d28a7c1296356a44b1949d56a6a1 SHA-1: 6960689a70f05dab9a4ff0bf881bd89329c9f1b6 SHA-256: ea7a087464d8c9d1a3aeea5ee825b5e4d974c263b59b36ceab9a6e8fe60b89b5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a 'Password-Protected Archive Lure' heuristic suggests the document is designed to trick the user into providing a password, likely to decrypt a second-stage payload. Numerous URLs pointing to potentially compromised websites or disposable hosting were extracted, some of which host PDF files, suggesting a distribution network for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://ecompletecontact.com/ckfinder/userfiles/files/71475951497.pdf In PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/g1035mm6iij9bsi71297up3ni7/vozavek.pdfIn PDF document text
    • https://pasarantogelsatu.com/contents//files/81266102087.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/qtsug83ijpg01uol5pn36a0t8g/noxalalevexutazemibenokaf.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/578005ed7d27edf8a891caff59b789d5/13328529189.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/76792997935.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/xepegonuzabisokunepabole.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161014026cbca2---dozapenuwa.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b834465c033---noxujawufuxuta.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/20870561215.pdfIn PDF document text
    • http://minhanh.com/files/68154127827.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/sepusasalegirir.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/gm19788abqrqd8l4av2rnvvb1u/12370462599.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/4f5bd672f57944f3934094734422c37e/45549897537.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/vexapiwiluvani.pdfIn PDF document text
    • http://www.kingsmen-cmti.com/upload/files/bototodubotunof.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ec91a44fa---lixunagi.pdfIn PDF document text
    • https://studiorampinelli.com/file/tibewe.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c6fbbed55---87978118567.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/vegenetidasudurulotuxojon.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/f2339741543a9b4730deb63c602b10cc/sadipalilomomovadeg.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/35054418687.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/cc6f8de68d6147bec8afe1bc789dcdc9/wumatonodituzin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=comment+fusionner+plusieurs+pdf+en+un+seul+sur+macPDF 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_off0000dac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC7 18396 bytes
SHA-256: d75ddbbf3038ac5ab981f8fb8f3959f020a30a92d5526f7a2ba7d6c3ef96106e
font_01_sfnt_off0001094d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12164 10912 bytes
SHA-256: 062d027832fe6872803eb08e88c527b68059fdec236ad41a8a2439312b5f5068

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