Malicious PDF — malware analysis report

Static analysis result for SHA-256 92c79076a97b9d6e…

MALICIOUS

PDF

73.2 KB Created: 2021-09-18 21:50:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e9fa1488e3f07c466707d2d58bf4ef8d SHA-1: a0d3e91f9cc9df3b4bea0901632b9fb8ffcfe7db SHA-256: 92c79076a97b9d6edc0bb1d56c03b8bc051e7f35ed573165dd9e73856d1b653e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to disposable hosting or compromised CMS uploads, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection or execution of malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=how+to+force+update+play+store PDF link annotation
    • https://araprinter.com/ckfinder/userfiles/files/moxobekivuronike.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202109160844168315.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/rujobuk.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/bopufezidofirikev.pdfIn PDF document text
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/ranatulosofinib.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///bodozubewin.pdfIn PDF document text
    • http://lynxauto.ru/userfiles/file/mogavesijurojexo.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/73169171582.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/kupakogejur.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/mv8qpc365nmtj71764udj35jv6/fejomididovigizezojotuwij.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/23632801456.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/rogexazunizazi.pdfIn PDF document text
    • https://tutorbolivia.com/userfiles/file/pawekenijub.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/gikebexeju.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/xurudesufafedaki.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/re22pa9q68e21es1fqqq96nrfq/tojer.pdfIn PDF document text
    • https://linkevicius.com/upload/galery/file/fekosefamitunafa.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/kowadetir.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/r635ne0jikc9p50uub0v6066v7/niwitok.pdfIn PDF document text
    • http://hagelkonzept.com/userfiles/file/66117285909.pdfIn PDF document text
    • https://tranhdaquyhn.com/uploads/news_file/nesit.pdfIn PDF document text
    • http://classtool.info/upload/files/21270006094.pdfIn PDF document text
    • https://bevasilicones.in/userfiles/file/masadosiziwogolozu.pdfIn PDF document text
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/2557712569.pdfIn PDF document text
    • 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_off0000bc2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC2C 16572 bytes
SHA-256: 2edad29bf19b8b92e62d6b9f813db700c143d5325cfac68fc77525962feda58d
font_01_sfnt_off0000e678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE678 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8F 10708 bytes
SHA-256: c234c6cd813d2e3d9ab55df791de62ccefa7f672e05afb1f1fbdaa9cdd15d3c5

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