Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9dea3237b26c73d…

MALICIOUS

PDF

82.4 KB Created: 2021-09-07 08:23:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 25e671eef951a53e04606be10262bc0c SHA-1: 35676b25c63f66a6b60cb5e9fab158cc53196061 SHA-256: f9dea3237b26c73dddc8c50cb33535213ab6ef7198d1481424b573b8c6c79c50
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links. No scripts were extracted, but the structure and URL findings are sufficient to infer a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • 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://allytemp.ru/uplcv?utm_term=nys+durable+power+of+attorney+pdf PDF link annotation
    • https://ykitraders.com/UserFiles/file/muvodidef.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c5164534a2d---28651933311.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/waxiku.pdfIn PDF document text
    • http://allasclub.com/campannas/file/zegemalogotujukobokife.pdfIn PDF document text
    • https://chornakorn-packing.com/ckfinder/userfiles/files/82696242072.pdfIn PDF document text
    • http://elitacasa.it/images/file/jamodadorisurawilomod.pdfIn PDF document text
    • http://mtntoproyalshihtzus.com/clients/4/42/42f4769cb4f2467af64fea76c5682520/File/jokegasimefegujoxafubow.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/66832150295.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/vegutoruwifupunu.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/96694883412.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///jefalizopubotilutelo.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/30d4d8408379bc57f80863d3b009efbb/56042652214.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/d81eac3b5c09b39beec66c09f05aa25b/zebogekubonu.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/kamumeb.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160785bc59b657---garadidatiwitil.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c51364d3b8a---jojiwimeso.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/slaoncrj6cn4mta7dkge9k0rrn/wosijojawodorojo.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/58801526161.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080e9c7d2252---70291234397.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/zijobaro.pdfIn PDF document text
    • http://kbinteriery.cz/userfiles/file/85832592942.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/c52193be0bff593d30e569e9c28b181b/xafivazijabinupu.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/wibaposenu.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/zamapiwiju.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_off0000dc66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC66 18292 bytes
SHA-256: 8628764b7a008bf2fd03e06a41aa7b98de9bdbde949c15a15cd03bf7ea151fa8
font_01_sfnt_off00010ad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD6 10816 bytes
SHA-256: 597d581f390724d6eae4dda01c8f75e9625f72fc189482ab0cedf817a209acb9
font_02_sfnt_off000123c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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