Malicious PDF — malware analysis report

Static analysis result for SHA-256 65e7375dce566ec0…

MALICIOUS

PDF

81.8 KB Created: 2021-09-11 19:42:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6da847a01cb4cc8d0ec390117ef796a7 SHA-1: 7d7c6b25b155f8f3d1b5e2f06144706a48c184f3 SHA-256: 65e7375dce566ec03037f184d522ce0698e766f18d204b1c2cf37837fc383947
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://coopinproject.eu/ckfinder/userfiles/files/fedijagujukebosudedat.pdf In PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-8/20210908042914763264.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/7adda1eed08691c88507ac4b80a4a34a/xugijepafebasofetekoz.pdfIn PDF document text
    • http://fmdscu.net/userfiles/file/51054161858.pdfIn PDF document text
    • https://markaoyun.com/calisma2/files/uploads/dopekidexib.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/tadumokobofesatogibej.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/sozusabox.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/davozesimalimodinolafa.pdfIn PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/93460854849.pdfIn PDF document text
    • http://myslizdrave.com/soubory/59847141102.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613025d2ebbf7---dabuvudotuwefibaxafidi.pdfIn PDF document text
    • https://livbiopharma.com/userfiles/file/5757195219.pdfIn PDF document text
    • http://drzwiukryte.pl/userfiles/file/wofororarepumifobatewatup.pdfIn PDF document text
    • https://sergiomauri.com/images/file/19239990850.pdfIn PDF document text
    • http://xn--80aadcnaeutgftohcogh8i8dsc.xn--p1ai/pict/file/71133997974.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210910_11298D9D3F61B2A6.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/520b5bd02d05a68c216e6cbba35fb184/towarevabovisuxuguzen.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/xadedowitisazagawexiwa.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/73183211611.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134d99415193---71760657967.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/a4b1sh4lrdonrqbtqm2leto1d5/58874783213.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/mufubipojelofuda.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/vuwomubunowozotewosaleve.pdfIn PDF document text
    • http://bjyhyy.cn/filespath/files/20210901213537.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161354b51ee9c3---robasijidibod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=hogatoga+call+appPDF 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_off0000df5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5D 9944 bytes
SHA-256: eb85cc164c57f840153188f89f494bcf17d54a9e60138c62f2edea11273c0c5a
font_01_sfnt_off0000f57b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8D 16804 bytes
SHA-256: 7fcd711076c65bdd37a793adb91ff85f00af4a5f7aa96be8b2bd1010e5199af9