Malicious PDF — malware analysis report

Static analysis result for SHA-256 45fb13d64797a902…

MALICIOUS

PDF

76.7 KB Created: 2021-09-10 23:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ae5fe761a59bce75a6fa9575066a3ac9 SHA-1: d937b0b90df5c96fc2bfce8aea1f96099a56ea42 SHA-256: 45fb13d64797a902e016c71e9dec5c11b2393adff29d5843b1a8a59806595c3c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external links, some pointing to compromised CMS upload directories. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of link farming on disposable hosting, suggesting an attempt to manipulate search engine rankings or redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://stollerco.com/testingsites/advantage_aviation/assets/media/file/ravomatijosifaza.pdf In PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/tifiledarexewutokogowapav.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/devogebugomotuzemep.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/rawilabogomipo.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/webokivubomijojawetakivup.pdfIn PDF document text
    • http://snft.ro/media/file/lakakopelorupamomofab.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/6365432236132f3eaa2c99.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132750584bd3---84750087491.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/28999977438.pdfIn PDF document text
    • http://ptsound.com/plugins/ckfinder/userfiles/files/vebavisoxagolow.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/sukixovukasu.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/80828948476.pdfIn PDF document text
    • https://jogamiskolc.hu/ckfinder/userfiles/files/filasode.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a657be291---dajewug.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/13668055839.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/4062090233.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/zalezenavuwuvegomarig.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/purafenuxepapakebogexor.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/zuwozawapap.pdfIn PDF document text
    • https://haidangpc.com/contents/files/44667666932.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/83586165428.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/48237830974.pdfIn PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/53459538424.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/podulokezuna.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161338f9f5cb41---fiporuponezarekuxunejuk.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/61704078401.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=play+store+ranking+gamesPDF 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_off0000c896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC896 10660 bytes
SHA-256: 759bdc9070a96c22f1a87954004b31def6c83e4cd698924262a0ca4cc8143fab
font_01_sfnt_off0000e116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE116 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF928 17008 bytes
SHA-256: 1fbf9c04099c9c1c510f438f09ce1dab9071807b8ab60d04b5934ad5474c660c

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