Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ec600d225b655ce…

MALICIOUS

PDF

72.1 KB Created: 2021-09-02 12:49:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a8c672c1f1212eddfaa873d416b9dff9 SHA-1: 939b444c28f0f2012c8c9a4d44b60536f64a4863 SHA-256: 4ec600d225b655cebdcfcba4355a5e05eb629670a2451b9a69f69769f548af08
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing lure, indicated by the presence of a link farm pointing to multiple compromised CMS upload directories. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the structure and URL patterns are consistent with attempts to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://michellenevinracing.com/FCKeditor/file/kixeduwumer.pdf In PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160df860c090b7---72226462961.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2c0e84303---29714861746.pdfIn PDF document text
    • http://ndt-ultratech.com/files/gisamawelizebegati.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/31546649095.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/e272d0c9e179473081cb70fa55fe58b4/24423832092.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/66b45denf2jr82c6pf8grqh16n/lemaje.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/9da814cd8481df1c092666721b931f8a/56252705079.pdfIn PDF document text
    • http://reneenicoleevents.com/clients/865995/File/kuturutikaj.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7cb027d3d---vefujatodidutudogogeki.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/2382221158.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca671534c8---ferematisu.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/zonixodokofujodala.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/semejoge.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/negogigigepubavojemu.pdfIn PDF document text
    • http://schmetterlingsgaerten.de/file/bezaxabatowalovizew.pdfIn PDF document text
    • http://jakebenmd.com/clients/0/0e/0eef9d569b11303d075d19626cc6f958/File/mowotarasonixewuga.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/52047554307.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/fbca54a21f4ba3be17200b16bda08a46/99751820850.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909fc92fe69---gapikawividadikufifusur.pdfIn PDF document text
    • http://shepardfarm.com/clients/877021/File/24129964075.pdfIn PDF document text
    • https://viettrungson.com/media//Files/16115327849.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/wojoxulesinaxafin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+merge+two+pdf+files+redditPDF 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_off0000b8b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8B2 10652 bytes
SHA-256: 406a905cb087e433ff383c2e0fd6c481c56e52b9e0e14f5207c7f25ec572882d
font_01_sfnt_off0000d0e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F3 16168 bytes
SHA-256: 8aa4aa786051a2dbe6ed074bd7d140a3f0f99975f5b95c7c24fde8fa0f11c367

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