Malicious PDF — malware analysis report

Static analysis result for SHA-256 f29207ec55469ebc…

MALICIOUS

PDF

75.6 KB Created: 2021-09-22 09:26:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 324869c9f8f956cb9f015daa3fcd75eb SHA-1: 3f670d4c98ba3f9a19a9a7d4c24a8e2d33cc990c SHA-256: f29207ec55469ebcf29255234ad576ee3b6053034d0a06b96b3b74cda9a4e4a2
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers flagged it with high confidence. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The presence of embedded URLs and the nature of the heuristics suggest a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://oniceh.ru/uplcv?utm_term=siri+apk+2020 PDF link annotation
    • http://anabakorea.jp/userfiles/file/kumudididojutalazogunowul.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/80257729710.pdfIn PDF document text
    • https://ratosatu.com/contents/files/lazonunajakujem.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/sopam.pdfIn PDF document text
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64335121216.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/gitelixizi.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/merijosafigodiduzuburoz.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/mopiwesozorunimowiboturiv.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/datevezuxogukato.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/buliwuwetexabovan.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613870453993b---76307068639.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133b73bde1d0---webitovazotavixexamidike.pdfIn PDF document text
    • https://clubon.top/uploads/files/98390619747.pdfIn PDF document text
    • http://mzch.pl/userfiles/file/pokopapenakijekizevarukov.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/luxixitoliseg.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/29297054958.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/nc48shbugcfrpbch8d7non1ira/madokagemujumolevu.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/rosojubodunipukodeguwa.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/nonifavuwovepopaga.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/1e263a1b7dbb2740d3ec3cefb17f3fce/wusijurig.pdfIn PDF document text
    • http://boston.pl/fck_pliki/file/vakoduzorisiv.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/miwed.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/37802158273.pdfIn PDF document text
    • http://bbu.vn/Images_upload/files/gotadogurasirit.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_off0000c69a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC69A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000deac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAC 17192 bytes
SHA-256: 952342f74a7187a111873e5f37c9d147aa5634c63358e718f484450e577579f4
font_02_sfnt_off00010b0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0E 9988 bytes
SHA-256: 596a78edfb37b9ca3616fd3b663c3b4e3383583c06ec42a1f9fc5cc15a8e9e04

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