Malicious PDF — malware analysis report

Static analysis result for SHA-256 87839812710bd8dc…

MALICIOUS

PDF

69.7 KB Created: 2021-09-25 20:48:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e9f1713c72c702a07ea2ef1594eb0007 SHA-1: 2b2c98f44f638652bdcd4610ea764749bd05a526 SHA-256: 87839812710bd8dc5e614db152689d42da99de84bb0f7d8c67a2ca9f4174b377
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised websites or disposable domains, likely to distribute further malicious content or phish for information. The presence of numerous external URIs and link farm heuristics strongly suggests a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://huntic.ru/uplcv?utm_term=how+we+can+get+free+uc+in+pubg+mobile PDF link annotation
    • http://panel2conso.com/userfiles/file/49536884485.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4859b30de---kujotoxisifasizowojor.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/44172134908.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146e3e228378---bidapodovedadevipik.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/30025428948.pdfIn PDF document text
    • https://wanna-drive.nl/files/File/83672738254.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/d7b2d34ec93c036d5468e14a52835724/kivobekijegovibubanol.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/16213111601.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16131cf2f9dcff---beletawesafofepojajobu.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138d146bd220---zudubugitenujileja.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210906033439.pdfIn PDF document text
    • http://systempro.kr/userData/board/file/kerupimigugemalapunejalo.pdfIn PDF document text
    • http://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/diruzifatamixik.pdfIn PDF document text
    • https://datawire.gr/files/files/74369317239.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/12142416098.pdfIn PDF document text
    • http://wenfengsi.com/wfs/WebFiles/file///2021090422562497.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/7dohibdjcltte4poi9ld6pvjvo/pevofuvutawat.pdfIn PDF document text
    • http://agro-norwa.pl/userfiles/file/juzujadafanaru.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/xudigezuteletiruzojalovu.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/3d4172de73cc27b2312ef8f72f82f393/3770980177.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/28302496090.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/pusibi.pdfIn PDF document text
    • http://ladna.pl/user_images/file/vovarejisojenalalugekinin.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_off0000afba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7CC 15812 bytes
SHA-256: 7b5d6ed05cdd64f1c02f39b8513e106467605882844a13389a8efc935487d2f1
font_02_sfnt_off0000efd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD7 10972 bytes
SHA-256: d921039ead6278430d25dccf7405feb7fd6f5390728058ebd17687ff74b58b90

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