Malicious PDF — malware analysis report

Static analysis result for SHA-256 826bd6d2f99fa9a1…

MALICIOUS

PDF

87.0 KB Created: 2021-08-20 19:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9d9736572e8352184ae6c3105fb36912 SHA-1: dcdf9edd7fd0729cab5de8318c2604dc879186d0 SHA-256: 826bd6d2f99fa9a19813f1eec5eb162a2ba12285d0ca87e4899859f91626a06b
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external URIs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://oniceh.ru/uplcv?utm_term=siemens+hipath+580+v9 PDF link annotation
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16077d30d3c16e---72753853398.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/3acogc99l0icirliom9feslhl7/nekoja.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/d0b80d13ae03041f539493926f9802b8/juxazofexapotogade.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/dopevineluzajorigeru.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/0ab7ed5b8fb51122450b4d434ed0e29b/6902586566.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e94531abc5---34167244051.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160749273a0751---45548163726.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609611e1f13b7---81714328493.pdfIn PDF document text
    • http://solartgaleria.hu/images/file/pekokuxupilosesekajazajo.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/mumubiseva.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/39a828ed836d0133190f3c77f228791d/milemowuwepabogi.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/93666733760.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/direnoxowagazenadow.pdfIn PDF document text
    • http://caryhigh1987.com/clients/41333/File/69199980114.pdfIn PDF document text
    • https://mimpishio1bet.net/contents/files/fidadujinenubaje.pdfIn PDF document text
    • http://cloverpark1960.com/clients/1/17/17c242f0968dc4bce059666b43fbd075/File/zotazitewowazurozuxa.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/zuvutukakinerilu.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/21128637907.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210718_204849.pdfPDF link annotation
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/d57bp0p7nfnfq6b3is67u8ovf7/domoloferodew.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608099919ea7b---wokerupabonoriseb.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/21014304267.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/19020310269.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/14536857994.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_off0000e2be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BE 11024 bytes
SHA-256: 27475af970de30c79a3dffdadffa581568aabfd83d7420ee2859ee6139975f4f
font_01_sfnt_off0000fc38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC38 22296 bytes
SHA-256: fea0c402bef1754c1c2fd81eb541b602d8799359d0e6e1c994330a2ce3f97325
font_02_sfnt_off00013499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13499 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1