Malicious PDF — malware analysis report

Static analysis result for SHA-256 43a28178226dadfe…

MALICIOUS

PDF

86.6 KB Created: 2021-08-16 18:05:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2e690767f4e1c110ab9c756a4ec3d4ca SHA-1: ec3214d539b4d98bba4242b31f43255b686d9921 SHA-256: 43a28178226dadfe09fcd068f0032161d6081040947e47928c30665c50a6b956
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users. The PDF is likely used as a lure, potentially for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://classconnbio.com/img-jacson/files/vogewu.pdf In PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/i2itcin2ag66b68j6h16ei79ii/73044626787.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/wuzomonudoludalom.pdfIn PDF document text
    • https://jurad.eu/files/file/gotavokilarow.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/fcan93m5ahl4lu7gdqd012ae5c/16604616458.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/39109545995.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/bofibog.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3627990cd---wijawolimuzibazisuloze.pdfIn PDF document text
    • http://linza-market.ru/upload/files/bowefuwevapekivu.pdfIn PDF document text
    • http://usateatop.com/_upload/files/vexoxorukuna.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/37340823816.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/69737269744.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/5g0r26644mbq34t596o7q4rtr3/10278415508.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/jezazameradelufokimorer.pdfIn PDF document text
    • http://kaies.cn/upfiles/210815202425576218z7gyye.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ade5d752bff---jijumakubizuzopok.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/49ec9c4d0c7c4d835cef73ef24b85d00/29480643205.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/23352579720.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/12651363813.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/wotafegebekugefu.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210717/1501179524.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/11637989651.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=what+is+the+definition+of+motivation+quizletPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854b3b46ace---kisubosasazi.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_off0000ed1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1B 10884 bytes
SHA-256: c90a65a3cfb98eb0011656baf24c9345570e74481eb7744e2c9fa927e569b059
font_01_sfnt_off000105eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EB 17068 bytes
SHA-256: 69f52bea247ecc48918117f3335983f84dd0b6e3af8459b9969b817de8b89579
font_02_sfnt_off00013213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13213 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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