Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae43f9ef518742c6…

MALICIOUS

PDF

71.2 KB Created: 2021-09-26 00:48:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9b05e8d1404d0659b219bb2f7444486b SHA-1: 99197e1c2679cafeb5e6381cc0f9c3f74bdb0015 SHA-256: ae43f9ef518742c626898f735838d5caa4b0605f5a8b71392cb4b64682bfd240
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be hosted on compromised or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://thailonghoang.vn/upload/files/pimavidalusizimuvalovudu.pdf In PDF document text
    • http://balone.net/_upload/file///sulutaxitugusaxoguwud.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/25528541586.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147daa40bc37---papidakigig.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/golorufo.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/50781921162.pdfIn PDF document text
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/wumesoselogor.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/55119572085.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/muwekifeforepil.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/fitenogowaza.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/magoteduvat.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/1213980069.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/lusepa.pdfIn PDF document text
    • http://siblom.ru/files/upload/file/58989399105.pdfIn PDF document text
    • http://interroadholland.nl/userfiles/file/butidatadatisanutuse.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/61904124641.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/vidifigosoxefalowu.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/b3c58f1b6e95746d339e8f9d7d1b2fe9/renunezegovajakotese.pdfIn PDF document text
    • http://forglory.cz/ckfinder/userfiles/files/43449149470.pdfIn PDF document text
    • http://ovecollection.com/royal/admin/images/products/file/49865595097.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/42542246919.pdfIn PDF document text
    • https://eurotig.ro/file/givenozopixadakigetebos.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/49565244169.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/10154010305.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/32760273589.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/90877305324.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613329c1b33ba---jinozanava.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/71509464375.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=apple+ipad+air+2019+price+in+pakistanPDF 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_off0000b451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB451 16080 bytes
SHA-256: c3ccf2cc8eb6c275ebe00c584c725b13a2ec2d30555bd265e02fde8e735ab212
font_01_sfnt_off0000dd72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF589 10920 bytes
SHA-256: 6fd7cec99e15e0a8e773051ecc24faddbd5aaf68691257135a6f9589da55e559

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