Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbca5c0d347064d1…

MALICIOUS

PDF

81.0 KB Created: 2021-09-02 05:18:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 616c0c7a9c9eebc0ad750ab2cefa6de0 SHA-1: f37e4008d9bdb04bb1c053e2c271b567a6b64ac0 SHA-256: bbca5c0d347064d1853e414b8ad8734cef5cafafd5665955b54734716e39fc17
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites hosting PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the structure suggests it's designed to lure users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160afc71b0b3d4---rimezekovipeburar.pdf In PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/6fac11acd4115e0da6e13ae85cd753dc/podizite.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608976d2c15fb---titikipom.pdfIn PDF document text
    • https://gyandeepjkss.org/userfiles/file/84696890018.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/uc62ku6jde4t7hi833k7i9j5t3/52169933696.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/xisuradikifodunafegibe.pdfIn PDF document text
    • https://hse.tw/upload/file/29632075660.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/d787867f08041ab2ce24551276a36289/29258554118.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/7990e4930302cd8929287b2bce61cd75/wifavi.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/47216104683.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3edcaff217ab1a96d4739dd87fd7d59e/13679516685.pdfIn PDF document text
    • https://tomclarkvoiceovers.com/userfiles/files/142653016.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/pivarosebag.pdfIn PDF document text
    • http://wearefamily1234.com/clients/3/31/31b46d3307e4516335aa88350909469c/File/27955560555.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607de1b79d7fc---xorano.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f56886d5f3c---28676298693.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/jozeguwuzutiwezigudolazo.pdfIn PDF document text
    • http://kurpinar.com/img/userfiles/files/15341055345.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210527193130.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/b0faprasss3ilq58aiii6v8bbc/94581681799.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6eee6c1faa---93026889522.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6937a5d91---50419279963.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/nurafutewezowijeginano.pdfIn PDF document text
    • http://www.jysunshine-hotel.com/up_files/file/libodonus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=physics+for+scientists+and+engineers+1st+editionPDF 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_off0000d70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70A 17564 bytes
SHA-256: 1605ef6037073b609b1b650751c9fc32b237fb62261a900590c0d3fbeba32d01
font_01_sfnt_off00010539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10539 10876 bytes
SHA-256: 2654ac2534d8a4c39db96806fd80a4d45901b5f057423a4f5da58035c18b63e7
font_02_sfnt_off00011e33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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