Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff9d9fc0c06f228b…

MALICIOUS

PDF

80.4 KB Created: 2021-09-17 15:58:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9fda07e32e9a4608d82d97b79633287d SHA-1: c7247817d47e44ecdf1ce5d92c1f43d9ea6951f6 SHA-256: ff9d9fc0c06f228b5facd2639d24eff41350b1f9802b1da9202ecf86bca3a84f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous external URIs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs suggest it's designed to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://allytemp.ru/uplcv?utm_term=how+to+upgrade+android+10 PDF link annotation
    • http://bsinteriordesigner.com/userfiles/files/rabofejamivarakubi.pdfIn PDF document text
    • http://exosushi.com/uploads/files/91122833006.pdfIn PDF document text
    • http://freestyler.cz/img/file/tuduvawubogazubaterozor.pdfIn PDF document text
    • http://ctcinsulator.com/uploads/file/32049869716.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/0f4278d73a1326fc459c74062a7fec53/40190717016.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/52174559529.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/ferebov.pdfIn PDF document text
    • https://www.domosystem.gr/ckfinder/userfiles/files/79205497832.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/42878500763.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/wivujomeno.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d16544ee7e---zinafejusujew.pdfIn PDF document text
    • http://biomax.shop/filespath/files/20210902183342.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/wuzojurusavipijagevi.pdfIn PDF document text
    • https://miet.hu/kepek/56101741368.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/xazuzudaxinima.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/xutosiluriremefadojapeki.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/85483861732.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/lukebosazegepebumes.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16132f3d57fb16---99769998371.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/xijigawuravafakijek.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1631335580.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/siwefenolesadomo.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/42612363748.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_off0000d754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD754 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6B 10704 bytes
SHA-256: bbdaf0d45fbc2bc9bafed329e74bd1c0460e0b47056dd7858f2ee6c9a680b5a2
font_02_sfnt_off000107e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E7 17308 bytes
SHA-256: ccff125e49dca07f82ca5bfdc7de7d0e4c78d06aefb688c28c7ac1d4a94e6008