Malicious PDF — malware analysis report

Static analysis result for SHA-256 76b3a2670e8d673c…

MALICIOUS

PDF

80.5 KB Created: 2021-09-02 02:50:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b838be927ede73437809c7108765daad SHA-1: b865ae18427d6de20037d9834bc408463745136e SHA-256: 76b3a2670e8d673c8f8509170bc6e8da9315251766d966624203338f41753d25
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve to redirect the user to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://nomylo.ru/uplcv?utm_term=the+state+pdf PDF link annotation
    • http://skipjackpoke.com/ckfinder/userfiles/files/24261348121.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b37d870a2---65001432417.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/22338901461.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/e9e68cb06d2abcbfb86add839f6de935/57408021674.pdfIn PDF document text
    • http://superazs.ru/images/news/file/14728090305.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16094a53bf14a3---nutibimaxuminisidopat.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/vekuriwir.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/7senhfkkh11co0lpj2efrs7l1c/843542295.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/lojolojasakolabon.pdfIn PDF document text
    • https://itexpertdog.com/upload/files/10075020029.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/tusawutijosijonexusokodaw.pdfIn PDF document text
    • https://thietkewebseo.com/webroot/img/files/71137961369.pdfIn PDF document text
    • http://kennycojewelry.com/userfiles/files/202107/1626131361.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/38ecd047f38446c8282e8211bee33b50/rojuwok.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/9j75qcccf7g90dg739lmc0je7r/89672653603.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210728090148.pdfIn PDF document text
    • https://arerp.kr/data/file///xapadusemezowarigivokawuw.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/82330024550.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607e492bdb541---86861518355.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/mamixuzuzekevirep.pdfIn PDF document text
    • http://asustainable.com/global/file/26705784201.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/62853811719.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/namaremunetawevewidaj.pdfIn PDF document text
    • http://joeun-it.com/userData/board/file/xuruno.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/72083013948.pdfIn PDF document text
    • https://ykitraders.com/UserFiles/file/30574983424.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/cfc567d5969f86a1ec4bb67bb57c6f12/juwemuv.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_off0000d659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD659 10096 bytes
SHA-256: 92016c48f51c08523b7c6d957b3d4f485f3eb8697a6d5d5da3457c8d0c7d5551
font_01_sfnt_off0000ecff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFF 17636 bytes
SHA-256: bb5b0bf179134cfc0e9cc8a7812bf1b2898e5e4583d669e2b97e1aa20e797014
font_02_sfnt_off00011aae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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