Malicious PDF — malware analysis report

Static analysis result for SHA-256 96c58e17b0d4ebaf…

MALICIOUS

PDF

73.8 KB Created: 2021-09-15 13:18:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 38765f23c43baf86bb9a7baca5ede7da SHA-1: ac68819d29702aa14ae0b4d50e45bc4324c28fb1 SHA-256: 96c58e17b0d4ebaf754a4a99dea2540e155ab1f82d77f92937a2fb277b106259
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://garglob.ru/uplcv?utm_term=android+download+manager+keeps+downloading PDF link annotation
    • http://idroter.org/userfiles/files/95454219377.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161413bb8b65e1---tusupozelexalup.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/47648192261.pdfIn PDF document text
    • https://n-tlg.com/files/file/1599758089.pdfIn PDF document text
    • http://iknow.pl/files/file/nomudavesiji.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/305a12007809cfc0f3d9b1a623a63cfa/jaxijapasusagijefigise.pdfIn PDF document text
    • http://www.instalacionescueto.com/nueva/ckfinder/userfiles/files/rilaw.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/rasizezifuletasitifanabi.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/92744736702.pdfIn PDF document text
    • http://pengyou-english.com/FileData/ckfinder/files/20210908_FFC8EE11EBC35E01.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/38500461877.pdfIn PDF document text
    • http://potlista.com/file/files/82203219810.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/kufajoravibekiluneb.pdfIn PDF document text
    • https://hsse.hssanesteban.cl/files/13566299738.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/vukadefasimejitufevegozel.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/16054134059.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/sudezixuw.pdfIn PDF document text
    • http://www.smpnuenen.nl/images/files/pumopovasisinizowuri.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/19159185728.pdfIn PDF document text
    • http://pyhunlian.com/uploadfile/file/legudaxir.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5ea2e72ee---66270872140.pdfIn PDF document text
    • http://darec.sk/files/files/41307581585.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/xuduzagepibukewapurin.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_off0000bced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FF 16936 bytes
SHA-256: ef6bf574edbc6bcba0bf9c0ebad87e4dae0bfbf3b42f39ee929535b20ef22ceb
font_02_sfnt_off0001009f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009F 10796 bytes
SHA-256: 1fe1920b3f6300632361f1d909946c53d13015dd5e41acf4f15a70bba6752ed9