Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0dbde0081b4348a…

MALICIOUS

PDF

71.7 KB Created: 2021-09-30 14:49:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 132eec2a9c5cc6b63b7be461b0dbd94b SHA-1: 760cce688b3721aa0db26b14d2397cf1f3d687e3 SHA-256: d0dbde0081b4348ab42c11da505a07d040420dfdb0a664416c97ae60cf514cb1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The primary attack pattern involves luring users to these external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://esllearningbydesign.com/app/webroot/files/file/83623397004.pdf In PDF document text
    • https://ewastexperts.com/userfiles/files/ketilexirolezibilurew.pdfIn PDF document text
    • https://videoeffect.ir/data/file/74502083478.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/file/24998732374.pdfIn PDF document text
    • http://xn--b1adrijbbb.xn--p1ai/upload_picture/fibovenijarexiwatugivul.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16136f2fb89914---lovadojevukiduzewav.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/luzadavudozova.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/87398102775.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1614b2f19b9c7b---xutenivugipanujeposutogo.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/tamixajisikesaxevi.pdfIn PDF document text
    • https://www.campacinter.com/image/upload/File/reruvejidugo.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/dibesepolivipiguzelepanal.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/67415283541.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/9130004287.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/82555779643.pdfIn PDF document text
    • http://ymmicro.com/files/files/86727728680.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/potibebaginan.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/91977038535.pdfIn PDF document text
    • https://xn--49st2et51duvk.com/upload/files/rozomizi.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/94988491690.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e1487b8ff3---wuveb.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/vopuwoxodidulazepujijed.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/fijiramoruva.pdfIn PDF document text
    • http://tw-echen.com/uploads/files/202109190647526606.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/30806860200.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=feminist+manifesto+in+fifteen+suggestions+pdfPDF 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_off0000b5f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE09 16684 bytes
SHA-256: 366270a8abc7b3c0ba1171c260176b707b00483f77c4a9b82ce10bc90d652e82
font_02_sfnt_off0000f808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF808 10772 bytes
SHA-256: 6afcdfa893801ad7f7834677f3066b98dd9e866b049143ead28aca981f9a2dfe

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