Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea116be1e1d7a7b2…

MALICIOUS

PDF

95.2 KB Created: 2021-08-02 19:44:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 72563e6c62e2af13f6c36a167268d714 SHA-1: d29f24e6b766377b487facc3a1f047a483b0e566 SHA-256: ea116be1e1d7a7b230338894c412c9dee8bdeab78dca2a5c1db6d2057269d884
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristic analysis revealed it functions as a link farm, directing users to multiple external websites, many of which are hosted on compromised CMS uploads. The presence of numerous links on disposable hosting and the use of UTM parameters suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/0e1fed1115fd36853a75881b6ece3454/jidelive.pdf In PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/5c18ca082930902b395f404713ee1572/sovewugov.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/f80cde6c144fa3c14993291b6c8206af/33395215104.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/3619156351.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/63349966690.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160be447937436---78408347452.pdfIn PDF document text
    • http://doyen.cc/images/upload/File/11487505421.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/nuwetugopixenupop.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/72076023507.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ec436aa60ed---mewawosokes.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608874c124168---46280226130.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607875ffee1cc---6961423146.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607697bed5d2b---15908311688.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/funozebo.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/zamubuwakosowitonur.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/kakekive.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/nozupisanogisix.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/mojejeb.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/gopejozewibeta.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/duviveja.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/im41c72smvqesvr70ve2g0922b/tepakibezileviburapodik.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/83249275603.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210703_B7B1A0DF791C2417.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d723f31db94---63433196096.pdfIn PDF document text
    • http://fritz-fahrlaender.ch/download/60716380617.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=pirates+of+the+caribbean+theme+song+violin+sheet+musicPDF 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_off00010ebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBD 11092 bytes
SHA-256: b90469060249c6288cb350d3b87893684e7d10b6e2bd3e58f77b8eaf4f593a94
font_01_sfnt_off00012877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12877 17928 bytes
SHA-256: 4f3b99e9533a295cd304fb8cc564c832aaa883f437dcbbe0eb5ed551b3769233
font_02_sfnt_off00015715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15715 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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