Malicious PDF — malware analysis report

Static analysis result for SHA-256 80b7d9a0e5d0cbd3…

MALICIOUS

PDF

85.3 KB Created: 2021-07-14 06:43:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8a3dcfa409201d357ba47bde685452c9 SHA-1: 340e44a1b7483a7cbf0910f1eab930ae858cca36 SHA-256: 80b7d9a0e5d0cbd3d07d6821064cff8feff9f8ae0e840502e1f10ab711ee7b1f
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Harvest Credentials

The PDF contains multiple links to external sites, many of which are hosted on compromised WordPress installations, suggesting a link farm used for phishing. The 'SE_MFA_LURE' heuristic indicates the document attempts to harvest multi-factor authentication codes, a common tactic for credential theft. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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.
  • Document signing service impersonation lure medium SE_DOCUSIGN_LURE
    Document impersonates DocuSign, Adobe Sign, or a similar signing service in a signing-request context
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ca309821137---wovowiki.pdf In PDF document text
    • http://chukgoobok.com/files/fckeditor/file/tadezexenutaxopabosaru.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/fcea59e2d936b2b1591b12f2271ad5c1/rolafufuviketubidisof.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202106222121198559.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/gu1s4aqtko42e2majrp62g0g6o/nirevibutozirifasegilip.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/b3k9k4echdbo5aptbmtv7v6707/gifebolimafadefamav.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/495a1578c5dcea046a511fafe3d3899c/mozodediduse.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/9d52b562a853925d800da8c612195eef/lidinepasa.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/16287027973.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/dihp74tqotta60ratvl9npqv7i/61140204375.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e3d58fe3866---40637398531.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/30503947790.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/niferavoxudubixop.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/63167035348.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5ac231cb8---mibuv.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/b8996ffa8febf2af07720b19219b3e41/jufujuzaguko.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/20002528089.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/43496815971.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/7d6050398707a6e270b634ac6d6c3367/gujijavemivuj.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/28d75f4a2dadd3e2078287270cf1efe8/rudakapofewufamelajop.pdfIn PDF document text
    • http://termitecontrolservicebd.com/ck/upload/files/xadosapal.pdfIn PDF document text
    • http://porpora.info/imagenes/imagenes_contenidos///zesuledoti.pdfIn PDF document text
    • http://bmhs71.com/clients/c/c9/c97ff408e01126d63256cf68004d6641/File/76833141783.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+to+sign+a+pdf+using+digital+signaturePDF 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_off0000e999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE999 10852 bytes
SHA-256: 04f0d69df91b7b78491fed45ad50b059448a5da09247ec31d779c574d4760f85
font_01_sfnt_off0001029b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011aad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAD 17320 bytes
SHA-256: 26e4d4bca593015f1ac7e80ba243a4258b750061323816d185411da258c35910

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