Malicious PDF — malware analysis report

Static analysis result for SHA-256 3750b3faa4618cc6…

MALICIOUS

PDF

75.0 KB Created: 2021-09-01 08:05:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f44b83b9fc66fb1e72bdc37b40fcca97 SHA-1: f133dfd7ffe84c8b65c0e2dc2f7021d6195cb373 SHA-256: 3750b3faa4618cc669f050b48da7ee03ac12e8a5c3562b13ca7dd338375dd7c4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised WordPress sites or disposable hosting, indicative of a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages. The embedded JavaScript is a common technique for obfuscating malicious redirects or initiating further downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/kglvu9btcqbmnohvfk5el0bk3h/26045121000.pdf In PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607e66ad69e95---79294980882.pdfIn PDF document text
    • http://apnorajasthan.net/userfiles/file/lanekogodibosed.pdfIn PDF document text
    • http://tms-operation.com/upload/files/6145295047.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/46635076451.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/27425665133.pdfIn PDF document text
    • https://laserbeautymachine.net/d/files/vexuxovazokuzukomi.pdfIn PDF document text
    • https://chungcungoaigiao.net/uploads/files/52419785005.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/52685678507.pdfIn PDF document text
    • http://yorktownhs1987.com/clients/57482/File/89597390091.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b293a9535b6---juwijatoxonegape.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/qs8tavorl20k16i7cb55q22k47/lixadazuwitofon.pdfIn PDF document text
    • http://snsi.jp/image/news_file/topaf.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/52429078564.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/90558429612.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/20964523682.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/22272043185.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/b34e3d0a220cb710d3096526073a58b2/91385802180.pdfIn PDF document text
    • http://artospace.com/pics/file/25067821709.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/27118394527.pdfIn PDF document text
    • https://laps.pl/userfiles/file/67386065821.pdfIn PDF document text
    • http://medtravel.lv/images/hand_uploaded/files/20730051220.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/del3bcc4je3pg7g8a7cjf9kjus/77764088749.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=corn+fritters+with+canned+cornPDF 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_off0000c138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC138 17332 bytes
SHA-256: 663a88d82cfe0da9faea5f6b12c4b460737352d31ed066b81aa3ae75f69eeedd
font_01_sfnt_off0000ed06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001051d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051D 10644 bytes
SHA-256: 16aba468ae16dd21a73c8972cec289aa93a21a20592c6d734aa357227719ef72

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