Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2b2e1e18ce89f38…

MALICIOUS

PDF

80.0 KB Created: 2021-09-12 20:44:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 99ada205ea36d7ed1901478384e05109 SHA-1: 0f9c81e2ef7276895f32d75991b85d8e39fdf88a SHA-256: a2b2e1e18ce89f3833dda3897b1707c0e0f82454885453d15f80fe52c3b03771
212 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous links to external PDFs hosted on various domains, many of which appear to be compromised WordPress uploads or disposable hosting. The presence of urgency and download button lures suggests a phishing or social engineering attempt to trick the user into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 9

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://cructi.ru/uplcv?utm_term=tagged+app+for+android PDF link annotation
    • https://ambulatorioveterinariosismondi.eu/file/vadetufa.pdfIn PDF document text
    • http://aeusjtu.pretty-match.com/upload/files/bijuji.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/91262524979.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c48140db8a---81044254178.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/52272742131.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/jobujamoripukagi.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/49688915074.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea2c24e8e5---30094188368.pdfIn PDF document text
    • https://mavibusiness.it/file/musopamomug.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/76296259909.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d78ae66fe---jutuxamenub.pdfIn PDF document text
    • http://jfe.hk/userfiles/53329494775.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613190e1d8183---46174846775.pdfIn PDF document text
    • http://sinhorelli.com/userfiles/file/pokokefoxejelesaxu.pdfIn PDF document text
    • http://gomsuhoangminh.com/app/webroot/uploads/files/pufegedovenan.pdfIn PDF document text
    • http://kccmaul.com/files/files/pimij.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/38131252350.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/92200606013.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/sepizoji.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613913ee92905---87836567723.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/33901320267.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/2270763462.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kijarodo.pdfIn PDF document text
    • http://corising.info/sa_upload/userfiles/file/20210910022716.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_off0000d63c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD63C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE53 10324 bytes
SHA-256: 52ad8405f1f2d81bf488a9f62b8451a86b8abad903c96e41d3f59946ab2cfd95
font_02_sfnt_off0001056e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056E 17324 bytes
SHA-256: 81b006273a0a7e6208e30dd6ca50657f22a6f9259c07bab6c29212e4040cdaf7

Open this report in the interactive analyzer, or submit your own file for analysis.