Malicious PDF — malware analysis report

Static analysis result for SHA-256 b636373d37e6e014…

MALICIOUS

PDF

85.4 KB Created: 2021-07-27 04:38:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9b4fbf0386a006064f1ac5cc79f5b067 SHA-1: c2f86820ed02e4b2ccc2a4f0f78c3b10fe21c250 SHA-256: b636373d37e6e014db0043f4436edf7c596369fa5f60de71d23dc87074750fb9
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, indicating it functions as a link farm to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/257b39e1816884013db0323074f9a6dd/xewedawolaxuvogikukos.pdf In PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9fa96c9b8---batadepolujep.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/5d9142784aceffe4f7738176234c4110/gepokesevesosodezef.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/wopizodubegugavejupotema.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/899b59338b3b2b57ef7522f040048fa1/73136283392.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/guvagurawufeta.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a943ef145f---wipobajedovolaraxaza.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/ns0kqeerad3fn7lboofto6s6hr/wepavakawomef.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/kefawij.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/29295466695.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/43c580dce8f3c15d2e3a371a1ab34604/rutuzesevezegamew.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779ab8eeb69---mekisiwudenozikalefewawo.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a75624b2051---25654248712.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160706981df9bd---66573931056.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/6916861891.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/55639050566.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/8e2e7208fa2d4e71841d1824c6c2d6d1/98184799630.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/210733825260dfc750bc512.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/jefebe.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/vavisupevegatuti.pdfIn PDF document text
    • http://neoneofytou.com/ckfinder/userfiles/files/43270225368.pdfIn PDF document text
    • https://langestrand.se/anvandarbilder/204/files/96473295725.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/88088d72f74b618550e433bbfa0b8a70/26841461578.pdfIn PDF document text
    • http://kids-ex.com/43068951131.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=wiat+3+scoring+manualPDF 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_off0000e6df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF6 10708 bytes
SHA-256: f474e227f9ff312dd050bfee0e7252fc3280c2661d0cbe26d347f1ed813e5b68
font_02_sfnt_off00011794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11794 17328 bytes
SHA-256: 04258aee498f916f05a94a15570e5c8d562ce8014540bfbebe15dd637870ebcc

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