Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca7a803edb6da9e4…

MALICIOUS

PDF

71.0 KB Created: 2021-09-29 02:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 18e1638060b7687c0eff919b84ad4242 SHA-1: ece4a0ce24711a9abdda20b210432780efffcf39 SHA-256: ca7a803edb6da9e4b9ec6045d14c44fe7cd5326da430b0833a4062597b0f60d5
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://eau-msu.ru/ckfinder/userfiles/files/82742214518.pdf In PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/mixuvuredemarutinozadofo.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/ed11eb00336ccf586ef41dee87a828dc/kuzejodegu.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/jomonigizimemisu.pdfIn PDF document text
    • http://moscowballet.ru/userfiles/file/vixiz.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/labeputosuvenukut.pdfIn PDF document text
    • http://datev.hu/ckfinder/userfiles/files/muvabexize.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/xofubupudavogalok.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16143da971105b---tijalurijib.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/19640720373.pdfIn PDF document text
    • http://spheresignal.com/app/webroot/userfiles/files/basikurixabuxumuvetu.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad5c7a50d6---naxeratutoro.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/39664311279.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/92463188711.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210928230917_l6ykj4.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16152bf1eee5e6---xenowopi.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/161492557083e6---zisufakawofixol.pdfIn PDF document text
    • https://franchisebusinessadvisors.franchisebrokerwebsites.com/broker-site/files/files/54263530252.pdfIn PDF document text
    • https://premium-house.uz/images/file/ranuf.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/68602424156.pdfIn PDF document text
    • http://mis.nrru.ac.th/gradjournal/ckfinder/userfiles/files/boxanoranaluluwiri.pdfIn PDF document text
    • http://daejonggyoyc.com/userfiles/file/20210907034537.pdfIn PDF document text
    • https://matao.ro/app/webroot/files/userfiles/files/76982670520.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=imap+hotmail+androidPDF 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_off0000b13d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB13D 10308 bytes
SHA-256: 4b1c929102c9624a90de9202510a4b5a74bb9b8cdd1f0dcd76b9c2d21892d149
font_01_sfnt_off0000c822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC822 17488 bytes
SHA-256: 7c61e75eddef34e2e2cec1b8e0239d4b2d0b0f83f007e0279dbe36b37a1607d4
font_02_sfnt_off0000f4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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