Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f42b1d6faa1a2ba…

MALICIOUS

PDF

80.1 KB Created: 2021-09-22 12:22:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: caaf84d1e9175845ccbe898d785c8476 SHA-1: ac78cd49ac7235a7e569d1d10543691f1c569882 SHA-256: 8f42b1d6faa1a2baa7a57a0ff56afdd39acf6ca1ac7f41531fc11ca56a7acb17
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 ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://plantbiochem.com/ckfinder/userfiles/files/rovujobasexejavi.pdf In PDF document text
    • http://xn--e42bt3l.net/upfile/files/76957211794.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/mozupiladawiliwivazetava.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/rv04k9nhmct3aj5v9en2i79qet/45307586113.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/39307189904.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161490116d2f17---lifaxowone.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16144a3d6cfe94---18877082795.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/41880463036.pdfIn PDF document text
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/dawolafu.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/8077290143.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/5728146574.pdfIn PDF document text
    • https://teater77.nl/userfiles/file/niwekupebunekife.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/83330911445.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/fb52a527d12d281035f64bb12436396e/22373675392.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143e6cf96074---5189611239.pdfIn PDF document text
    • http://edeins.com/userfiles/file/20584402923.pdfIn PDF document text
    • https://terracell.info/images/file/17026981425.pdfIn PDF document text
    • http://vinacafe-dalat.com/Images_upload/files/xegafefok.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/03d6010da67010de566a762d8ca2a306/99571028861.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/nenulatesofanazogeka.pdfIn PDF document text
    • http://thephinhmienbac.com/upload/files/93889651464.pdfIn PDF document text
    • https://onlinendttraining.com/files/86664618189.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/40635821060.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=best+app+lock+that+cannot+be+uninstalledPDF 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_off0000d5a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A3 10896 bytes
SHA-256: a93a8b5f4627d04f861e6f276491ab6cf627ec85870f9f92a8a29e3677937371
font_01_sfnt_off0000ee96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A8 16908 bytes
SHA-256: a3ec00652bb164327d2614719636594a62dc529a6ee7db728f6770be4df9d5da