Malicious PDF — malware analysis report

Static analysis result for SHA-256 35f43d7d1201fd9c…

MALICIOUS

PDF

73.2 KB Created: 2021-09-17 14:43:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 8b2d1f92cb6d2ac50d6293092bb0104b SHA-1: ebf926a3bf7e812d12a9e825ee14a0c18e03ab14 SHA-256: 35f43d7d1201fd9ce2b6accc834463e242f2afe78fd9c4e325bbf456846e97aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URLs are consistent with a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://irlanc.ru/uplcv?utm_term=usb+otg+means+in+mobile PDF link annotation
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecfc0cfffc---61313310524.pdfIn PDF document text
    • http://actinq.nl/upload/file/39904734834.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/buxebovakakinalujerojuvir.pdfIn PDF document text
    • https://kiofruits.com/admin/uploads/files/76904751363.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109032049155264.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/dexut.pdfIn PDF document text
    • http://parfumland.sk/upl/32689196565.pdfIn PDF document text
    • http://otpetye.com/images/shared/file/pawekogupemux.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16143912be2bd2---jejovan.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/xoxofafawajawanunakilirop.pdfIn PDF document text
    • https://dpengineerindia.com/admin/userfiles/file/gojolefewemuboganetuzezob.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/gajugu.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306c6594bf9---28711762948.pdfIn PDF document text
    • http://phupmirpol.pl/userfiles/file/ximugikopuzomiputowibaje.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161318c4e44f66---rajonoxebaxem.pdfIn PDF document text
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/kofus.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61664746144.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/wewib.pdfIn PDF document text
    • http://www.pvvc.cz/files/pekapuf.pdfIn PDF document text
    • https://himalayanespresso.com/espresso_ckfinder/userfiles/files/nuxamefopativexuri.pdfIn PDF document text
    • https://ripedzn.com/app/webroot/files/fckeditor/file/kulagexodorenukeri.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210914_91AF9B6352133D57.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f57a93e063---suverilurutir.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_off0000bc91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A3 16728 bytes
SHA-256: 457323018727e2c6449ee17e303906c0057b98ea2c83f0aab8145bc3a7ca6605
font_02_sfnt_off0000ffb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB5 10500 bytes
SHA-256: 4094d80a2319248cb52a5a810567f1d7ffd7bca60ed6ba924cf5c671159977a6

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