Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8936d003cd35cb5…

MALICIOUS

PDF

77.2 KB Created: 2021-09-19 04:31:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c8e112da5549832b78bee96d0d27d300 SHA-1: a79793cef49d0b87e77707331496fb48fb687901 SHA-256: e8936d003cd35cb5e31a1b02cdd6d90c75892de3479a4a04646876eada5be691
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which are identified as disposable hosting or compromised CMS uploads, characteristic of link farm abuse. The document body is heavily obfuscated and unreadable, suggesting it's not intended for direct user interaction but rather to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://fantalife.nl/userfiles/file/49110156527.pdf In PDF document text
    • http://studiosaletta.it/userfiles/files/3249087539.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/porar.pdfIn PDF document text
    • http://erex.hu/upload/file/58755416872.pdfIn PDF document text
    • http://peknanevesta.sk/media/file/povaxutojit.pdfIn PDF document text
    • http://hkacca.com/userfiles/gonapifapebur.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/jaxizalafolozazus.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/2b60d82290ed10037c864b5ef240f3d7/kizarexodogijetusawu.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/69560603858.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/liwajaxo.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/12065891951.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/6c03fb510863281accad4722fa6e2d9a/50868408523.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145572d15f80---42936190706.pdfIn PDF document text
    • http://citranco.com/users/files/misojasitavilewufu.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/18299769117.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/dafajivekofix.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/zofoxowudobukedenarisa.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021090712342673499.pdfIn PDF document text
    • http://giasuthanhdat.vn/Images_upload/files/rinapawadak.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16145be95d4bdd---81438474031.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/81046865277.pdfIn PDF document text
    • https://nhuadailoan.vn/upload/userfiles/files/66769425426.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+insert+date+in+sqlite+database+in+androidPDF 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_off0000c93c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC93C 17804 bytes
SHA-256: be62f560c759b07b6402b4be05e22f9f5d944bf6184e7e6a5c19e48ff8399739
font_01_sfnt_off0000f6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AB 10604 bytes
SHA-256: 669fb73e7168e9eb85140b56c53c221fe6ec71ad145d853f7e4d41789c0b4bb8
font_02_sfnt_off00010ed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1