Malicious PDF — malware analysis report

Static analysis result for SHA-256 95f9d3d6b1bca99a…

MALICIOUS

PDF

81.6 KB Created: 2021-09-13 01:37:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 10b56cd15a77a526e09916b96af48174 SHA-1: 21fbeced34aabcfd3f032a1629f2ed30646cb74d SHA-256: 95f9d3d6b1bca99a18dfbe4575404599b3c36f59db81c0ff11960a3c3f368335
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple compromised or disposable hosting sites. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://optimustelecoms.com/ckfinder/userfiles/files/kisufobe.pdf In PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/kiclaph09eg3v1blre2faljf9c/65514660764.pdfIn PDF document text
    • https://madeirashopping.com/userfiles/file/tupuzoxuf.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/16631979438.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/62472292664.pdfIn PDF document text
    • http://huynhgiabaohotel.com/uploads/FCK/file/dubaveno.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/kenoxiwowapagivowukase.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/wanikiruwixokamejasofez.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/jowitaxuvoxixubemudizesud.pdfIn PDF document text
    • http://yibetter.com/data/files/tijexawoxiw.pdfIn PDF document text
    • http://knupress.com/pds/editor/file/zulibijabezudawoturon.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/jawobebif.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e760733274---verosojixidego.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/53601926.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/xonikoroseki.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/pikajogurijugenonozafuj.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/c2573c80bfe29560ccae8264c7881c86/tosakegazupaperosulajifu.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d271f33ed0---9494446932.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/bilaxuvafakesijivagen.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613da7d5e0868---vevemamu.pdfIn PDF document text
    • http://goldengatetaichiqigong.com/userfiles/file/57186132682.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/balidudutonaruratufeva.pdfIn PDF document text
    • https://investincarpathians.eu/app/webroot/media/files/94009851731.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=tubemate+app+download+latest+versionPDF 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_off0000db09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB09 10908 bytes
SHA-256: f9db4867a060a6279bee6d0f7e8b725c5b62a0da7902f8a1d91fe48d3b9f6cc3
font_01_sfnt_off0000f415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF415 17240 bytes
SHA-256: 90b6e18221bd32cb7fdd2b7c1ad2b29f0e23546151900a0cf99a7f8349042235
font_02_sfnt_off00012070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12070 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.