Malicious PDF — malware analysis report

Static analysis result for SHA-256 b802545598d1db3f…

MALICIOUS

PDF

82.4 KB Created: 2021-09-17 16:08:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: a37a2ad40228b6e307ec1befd60717ad SHA-1: 69fc0d9cb3b162725a55c4d5fe8b6d9e739c4e66 SHA-256: b802545598d1db3f812764cf1098c2a3992863b44fb71701bca61c8f6469810c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://osmed.cz/app/webroot/files/files/65528469604.pdf In PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/50575860111.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/46960281479.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/71987019128.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16132ac41b1fcd---doxurebodex.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/mapusevumotuxilokowiku.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/85857927060.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/faguzipe.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/25461828042.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/jinijiwonisiduxezexusi.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1613cbc00491ce---72636130748.pdfIn PDF document text
    • http://floramarble.com/uploads/bimiluvotagawegetilanox.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/688b3aaac06e3ca7fb69e1460578a9dc/76578124698.pdfIn PDF document text
    • http://roocenter.ru/upload/file/16273991143.pdfIn PDF document text
    • http://dekogard.net/deko/veri/_files/xiduxukoketilizonoxa.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/96849829632.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/42594987142.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/87032721779.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/poxasagadop.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/towexuwo.pdfIn PDF document text
    • http://cmtsport.com/pliki/54840294918.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/57056473230.pdfIn PDF document text
    • http://terminsk.by/pics/files/pufudufavigib.pdfIn PDF document text
    • https://huuphongplastic.vn/uploads/images/files/99679389671.pdfIn PDF document text
    • https://iphastkala.com/userfiles/file/7624677828.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/fibetebefositanixejos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=rich+dad+poor+dad+pdf+in+telugu+free+downloadPDF 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_off0000da84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA84 18496 bytes
SHA-256: 6692b5b302f2e3ab1eb67bf19e147d26bb2b1542ae067bff27f47c305057f4f5
font_01_sfnt_off00010a2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12242 10960 bytes
SHA-256: f96511bf42c501b2f10c852b1bc0c319b9e2b612446105c878da8961ffe0fa1f

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