Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8ede935736a5738…

MALICIOUS

PDF

80.8 KB Created: 2021-09-02 06:07:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cf29bea4fcaac9828765d4ba804e7f5a SHA-1: 119fd44bd3ba9ddc1e3ca24cb8cc73e7b60d978d SHA-256: d8ede935736a57385d02d8e64385bc54d40b5972e25d97113809caab108f505d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the presence of embedded URLs and the heuristic 'SE_LOLBIN_RUN_COMMAND' suggest potential for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/39100b4de9df4b757b9697ddf29df593/petazinepusur.pdf In PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/566e115c5354481614b0082e1208eeae/bemusuwumazimabone.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/48063658877.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/10538113195.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/99382532343.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/nelonojexunag.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/93890428878.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/10224714187.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/83787837644.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610b1cbdf3ac2---tijerifunaw.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/15279751098.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/so82mbj9f75bm2b1hh3opreha2/zozomixamapujevigomumepo.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/61920440958.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/62106337589.pdfIn PDF document text
    • https://maintogelonline2.com/contents/files/36862920321.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/58598944038.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ac2b5152a---32437696689.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/todaxelewifesegosumikin.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b964b786187---gibutirenisomokawema.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/sojigofililew.pdfIn PDF document text
    • https://majubesar.info/contents//files/tuzazus.pdfIn PDF document text
    • http://chieucoingason.vn/files/53947368895.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/c8b0d5cf78bda4446f3104bd43136703/pivesegixizikej.pdfIn PDF document text
    • https://pikewallis.no/wIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=simple+words+with+zPDF 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_off0000d89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B4 10612 bytes
SHA-256: 0ce471fab5763fc4c653efd9cd45c73c7fa82581b2aed065287f5ea0260d90d9
font_02_sfnt_off000108f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F8 17200 bytes
SHA-256: 1d092283076d292fd34b4ffd92398f12a71ab589fed1cda58f9e0506b6664b6f

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