Malicious PDF — malware analysis report

Static analysis result for SHA-256 699b31b7d50614fb…

MALICIOUS

PDF

83.9 KB Created: 2021-09-02 22:58:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 0f80c0b4ef0280f7fa903401ba2d8213 SHA-1: d47ac03ba977538b0c8fff7db3407b1ab8dad14f SHA-256: 699b31b7d50614fb6b3be05fff8ba08cf24ef2aa026dd010b80125034b0bc445
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://stolizstekla.ru/userfiles/file/4185675990.pdf In PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1608040e140bdc---40866377286.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a2d08198b---67564759210.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/899b59338b3b2b57ef7522f040048fa1/73136283392.pdfIn PDF document text
    • http://ezibra.pl/upload/file/neredotunakejavixagar.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/33281a746a091c788260284f8d06e647/50169809343.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/jimezunotezodebujafomu.pdfIn PDF document text
    • https://hideab.se/tc/Mediagalleri/file/xamudukimolupo.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/domovanomozaritan.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/24971274170.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/ildaqgu9k9kapcpvff8ik6gvfn/84807600104.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/48555254045.pdfIn PDF document text
    • http://fruitvita.com/files/files/xazoruzatuvije.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/24764630928.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/vowejudojib.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/b60a34a080e44918ddc3668181076ea3/mufafoxobulow.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/somidob.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/3f5pd1b0jb3ai6hjmcsfomg5t3/fijanekuzonazufogevirasup.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/9ps6ucjopp1o3rq6fk9m5us0g5/17128241135.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/0d4a83c3b7d1ab5566100d024fcb4f5c/sobesinazegozupuwino.pdfIn PDF document text
    • http://gysanya.com/upload/file/210730022322622481wou56zhgl55o.pdfIn PDF document text
    • https://moolans.com/uploads/files/92286591855.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=aiims+msc+nursing+entrance+exam+question+paper+pdfPDF 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_off0000e2b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC9 17520 bytes
SHA-256: 3a06d986b1ca50b945cffe3c890cad411d2bb2ba5d60999953a8c586cb4c81cb
font_02_sfnt_off0001279c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1279C 11248 bytes
SHA-256: 1c6f4e4f7f65e2d91d27d1ca92fd69f479e95e1f6b5fd09365f67bf88caf73d4

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