Malicious PDF — malware analysis report

Static analysis result for SHA-256 76b21465df824924…

MALICIOUS

PDF

89.3 KB Created: 2021-10-14 00:52:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 7716f65844d3f9937f204665e9cc4f2e SHA-1: bd6ac0f0953106d0a69d9d904b4801e41ffa80e1 SHA-256: 76b21465df824924c59bdad49b8e5a6ae9c89cdbcf6a9b949efc4ff1f7a4e28c
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, indicating a link farm designed to obscure malicious destinations. ClamAV and ML classifiers confirm its malicious nature, specifically flagging it as a phishing trojan. The presence of multiple external URIs and link farms suggests an attempt to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 http://hieuchuan.com/upload/files/gemaveturozopowineminorib.pdf In PDF document text
    • http://4yoga.by/pics/files/83617616538.pdfIn PDF document text
    • https://norservis.cz/files/files/zipelure.pdfIn PDF document text
    • http://avon-bratislava.sk/files/files/patedewabivugof.pdfIn PDF document text
    • http://bndweb.nl/upload/files/98743881862.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210922223456.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144f40cb5b39---52768435677.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/21753972404.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615d5365d4723---libidukotezewubijuvi.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/supimuzolezuwozevu.pdfIn PDF document text
    • https://panoramabyty.cz/content/fuvaki.pdfIn PDF document text
    • http://gianenricofabro.com/userfiles/files/pixexuziviwofesanam.pdfIn PDF document text
    • https://pre-www.bridge-academy.com/uploaded/ckeditor/files/71030453405.pdfIn PDF document text
    • http://tavio.su/files/file/bularamip.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16136c16744643---fesidotiteratugerev.pdfIn PDF document text
    • http://mgtuae.com/uploads/file/timil.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161592dafd565c---pamave.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109191952536961.pdfIn PDF document text
    • https://aaaxxion.info/images/file/46429359185.pdfIn PDF document text
    • https://sintasyapi.com/img/userfiles/file/34301099527.pdfIn PDF document text
    • http://tech-sub.com/userfiles/file/4490014782.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/gabivenisaguxegipowa.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/tisax.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/fakalapakajuzebijesos.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/vivuxerinofitujigavuleze.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/161469d4b79355---litupomedevovuva.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/85125749392.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/zagojukafizarudiper.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/UsNeCLCzgYg/uplcv?utm_term=how+to+paste+table+from+pdf+to+excelPDF 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_off0000f316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF316 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B28 19148 bytes
SHA-256: 1a6f4d9db332b9c3b916f2a352dfc60670f03cf2c84abf0b1d5bfc61f6e647ec
font_02_sfnt_off00013de1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DE1 10904 bytes
SHA-256: f05eb959f5aed1a3f96ff732e0bfd84f1f7ddbb19c5c0e68c7e3781c9dc4f0dd

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