Malicious PDF — malware analysis report

Static analysis result for SHA-256 28dfbbb934facf5c…

MALICIOUS

PDF

82.8 KB Created: 2021-09-14 02:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bcd6b893b95f48c2079f1297a0a03a27 SHA-1: 9727e68c8df6ec55d05fc00a41f8d12b72f4b822 SHA-256: 28dfbbb934facf5c363077e7120c302ac98a7ed689d137ea62954d19a81d93da
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous links, many pointing to compromised WordPress uploads and disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a second-stage payload via the linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ambulatorioveterinariosismondi.eu/file/xiledeketoxonudezuf.pdf In PDF document text
    • http://i-harmonics.com/upload/files/tojijawu.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/14616931900.pdfIn PDF document text
    • http://yoshitomo-kokubunji.com/jcfiles/file/wuwarutagawajotuluz.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/bosivebewawov.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328c659dd9c---12247901522.pdfIn PDF document text
    • https://masihpt2.com/contents/files/xozevetazevelakefefa.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a47f8a4305---98484333208.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/88857985100.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/15560373359.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/pakobifenojeku.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/finurazozibi.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/84696623052.pdfIn PDF document text
    • http://tencanpowder.com/d/files/9821217006.pdfIn PDF document text
    • https://transilvaniafishing.ro/app/webroot/files/userfiles/files/sekiwafedufofanowapexa.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/vizijipuxaxirigetenu.pdfIn PDF document text
    • https://omegaplus.bg/uploads/pages/files/tudoxanazuton.pdfIn PDF document text
    • http://119pump.net/d/files/jakilabapopas.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16139fab23bdb4---79552988659.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/tirilarodejopojawudunedep.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/tanaseviniwon.pdfIn PDF document text
    • http://frchem.cn/upload/files/97573711487.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/1148070177613d05b2ee156.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=11+pro+bangladesh+pricePDF 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_off0000da0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0A 10788 bytes
SHA-256: cd008d3cd99e0836ebb7160d4963382c9661e353df0849f3f6f0cb50705eab04
font_01_sfnt_off0000f259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF259 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6B 19856 bytes
SHA-256: 795f8583b5ad3188fa1bb534f495b79cd5218f8251eff76370036f679140b6fd

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