Malicious PDF — malware analysis report

Static analysis result for SHA-256 411cdbfda95ffc42…

MALICIOUS

PDF

80.0 KB Created: 2021-08-24 04:10:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bf1671a01bd08ad060ac988e2fab367a SHA-1: b1b654ceff23676cf34a9a46ecf959267f2ca61b SHA-256: 411cdbfda95ffc422edb1c292ec8ed2f056fe1ec0444c41e4832cc56e3bf0997
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to websites hosted on compromised CMS platforms and disposable domains, identified by heuristics like PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and numerous external links suggest it's designed to lure users to malicious sites.

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://99shayari.in/userfiles/files/lizibodaliwojobopavojiba.pdf In PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/qi71o7ictr8aptoi4j45smpqa0/piranopabejesikimade.pdfIn PDF document text
    • https://fishuntpesca.it/file/58240935395.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817de224e5a---papere.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/tukevimafetakok.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836958edd48---bitopozawisamekodisiwet.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/2541893338.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/63319243688.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609eba522f4a1---pixosonedesoxa.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/direbiwuteku.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/19557215636.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e252bc2b74---21718445992.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/15348293979.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609240a684270---7289375501.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/18370310007.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/44249498953.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/3a5f800258a1efddf063ba1dccc9c74a/83235572467.pdfIn PDF document text
    • http://chinahongji.com/d/files/moxazujav.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16206675686142.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ba702f5650a---19463078409.pdfIn PDF document text
    • http://slstudio.it/userfiles/files/78003625814.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/rawufamopa.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/02a2fe44a23c4f93a193e52f2f6ab038/fidum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=karner+blue+butterfly+life+cyclePDF 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_off0000d9f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F9 15740 bytes
SHA-256: 07d345d4b125539b94d532d6defe4b956cd1254c09da54ed61630cf826dda794
font_01_sfnt_off00010290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10290 10384 bytes
SHA-256: 7d316a63f43968a839d96264bec70fc6bd486dc984a99bab21b5a623bc377d5e
font_02_sfnt_off00011a34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1