Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f8ae2ae5175862b…

MALICIOUS

PDF

86.2 KB Created: 2021-09-09 09:30:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c78cc13cd651bdbb08aa2c99762afe5c SHA-1: 24a7f7f2c0b5be1fe1b8b651778f265d178b8227 SHA-256: 5f8ae2ae5175862be7834199c24ff97ced140b7788642f532a68a55047abcde5
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm, with several URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly indicate the document's purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://hazeloyun.com/calisma2/files/uploads/bemidid.pdf In PDF document text
    • https://hse.tw/upload/file/burunezewi.pdfIn PDF document text
    • https://carlojans.com/cms/file/68050485640.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/tevazovedifamosevukav.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/77863315177.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/89803719150.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/40305082311.pdfIn PDF document text
    • https://komunalno.vrgorac.hr/files/4736695373.pdfIn PDF document text
    • http://chpcentre.com/files/file/vilirowerugije.pdfIn PDF document text
    • http://d-innovation.com/upload/files/52613074862.pdfIn PDF document text
    • http://annabarons.lv/files/files/21112423405.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/15171628238.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210905103209.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/c7e6ba7879c7bd3d190b886d0b97a3a6/12899517116.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/3ca8e24c95275551f048ea3f7cfe0135/xugisotuxamigiju.pdfIn PDF document text
    • http://nifaelectronics.com/userfiles/file/49195724642.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/vududawadukaxevatisuvase.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/3ddfb5b248cb0e17c0c10d3dbd5c0cf1/vadadagewilorepefemis.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/dafopuvarufirifolu.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/najimi.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210909015949.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/valoruverute.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/rijebuzakupukexetalod.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16133961869fa5---93160365220.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/94195238645.pdfIn PDF document text
    • http://ruiqingchem.com/upload/files/41148781327.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=redmi+note+8+stuck+in+bootloopPDF 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_off0000ebc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DB 17632 bytes
SHA-256: 6d3f86490290c333daf8caa45e44b6cdb9ca2c712a40b6a85749e81097da6c78
font_02_sfnt_off000131eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131EB 11000 bytes
SHA-256: 89e8a3e52d3398b16a6bed39fa5e5e8effb5e17f081a9a1199d6fbb28fdff4e7

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