Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0221056e3572b81…

MALICIOUS

PDF

244.9 KB Created: 2021-06-30 10:02:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: b156e11d6e69637066d103e8176969ee SHA-1: 27138f3fc3f88de49765939eb813793c60eea2d0 SHA-256: b0221056e3572b815c0775b3aded0f1fef0aa246acd82beebfc9dee112301457
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to compromised WordPress upload directories, suggesting it's part of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9706

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/5c7059bc6bf699cee4e6180622dff88c/45554563218.pdf In PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/oe08ro54tcum9vb1642fia0oh9/novapomarigakugirarobi.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/nenotefuduwuf.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/mifewipimixuditigen.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16087d78b42316---gejew.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/mepojagevuwo.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f06151c0a4---22466413198.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078fac8555d1---nojaxalavinemelif.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/36496dea4da55a1fd29e45a4b989172f/4000625713.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609468a007465---40294235083.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/mi2n7o6tno5meua5kstqtojep1/74794797839.pdfIn PDF document text
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/tejaxojuwetapadopejik.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/rowopipefifake.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160af698b29372---gefuke.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/u9jd6krffdeds2rdfdvgc1jie6/gasuxow.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/64609003262.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1609a667c08b18---9207149060.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/91252631232.pdfIn PDF document text
    • http://garderoba.sk/images/_file/zexowibarezinaniradova.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16204586280832.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/20223867526.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/vf2mo85p9fl6b7haou4o04pg0m/zuduzewoxi.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/d5c12d0893df5d413f13b06f62e528cb/20948544147.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/dcc6ff2dbab5e51a91d3d47ddf987993/70882614098.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/wetoxubivexonomuv.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e53e4a31e---jepexoreginudowi.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a40e82c766ef0bd70220e74c1fded359/23740225000.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=blank+map+of+the+philippines+with+answersPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00033f4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33F4A 21480 bytes
SHA-256: af8f616fe89ca3136c80bd773efed7e34e7185b46de22483abd86daf7cc31c83
font_01_sfnt_off000373be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x373BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00038bd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x38BD5 10856 bytes
SHA-256: 2a91b50aac9a71aba4d6a1aadc90d04bcfad05314af3a9c623515e1632bd108d
font_03_sfnt_off0003a4bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3A4BD 9648 bytes
SHA-256: c834736424d630fbf663e72d53d39065c5d0de02d7725715a1ac34a5d9f46ab8

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