Malicious PDF — malware analysis report

Static analysis result for SHA-256 96662e3f6b373287…

MALICIOUS

PDF

81.9 KB Created: 2021-09-16 01:22:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c33bda850ddeb4a9b0d6480763e917dc SHA-1: 961a5bc1c113b943fc108d8ff58de4cc91b35052 SHA-256: 96662e3f6b373287d610789a2fee5404fa2ffaf813c5a801328f9854660a51eb
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting domains. This pattern is commonly used to distribute phishing content or malware, making it a likely vector for initial compromise via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://rulada.by/upload/editor/files/ziguvonoxilu.pdf In PDF document text
    • http://recviem.ru/img/upload/41618862101.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16134a81d79f5a---32208073491.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/46210328214.pdfIn PDF document text
    • http://msmzizkov.cz/data/dokumenty/kotagirolosev.pdfIn PDF document text
    • http://dieukhactransam.com/uploads/files/miwamapukisonawomuwupanej.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed86e79d0d---49905096309.pdfIn PDF document text
    • https://underworldgear.com/admin/images/fckImg/file/namexebumefewedoramol.pdfIn PDF document text
    • http://fullx.net/files/juboraberoxotinafup.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/vudax.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/53134719656.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/zepotufabafabenej.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/jerijixanore.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/gapaxowadituk.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/82367748568.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613509696667f---50823588713.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/60509416495.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/vasirovofedaxinelidut.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/ac1c0d9d123387ce851b33cfdfc395ca/32973131740.pdfIn PDF document text
    • https://ccskin.com/geektic/files/63826256344.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/m9ns3s8in59plf0520n06pm1e6/valesasadoketiridure.pdfIn PDF document text
    • http://ltptech.vn/uploads/userfiles/file/rijufududozelesosa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=rrr+songs+download+mp4PDF 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_off0000d784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD784 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF96 19132 bytes
SHA-256: 3e396fd7ad7428bde90456452607df7882935681d41c99b298895c055c778817
font_02_sfnt_off000121b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B2 10620 bytes
SHA-256: d25f08c93c51faf61a7253a7d3fa3482b56a326ee73bb2e3bcc435176337c28d