Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7bcb2a2f7c0cf45…

MALICIOUS

PDF

82.0 KB Created: 2021-09-02 12:08:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f8859042e9f8ca4a8e0c306deb0d63da SHA-1: 08b577437cbc1eb5780d7b1abff163e33479479a SHA-256: b7bcb2a2f7c0cf45a961954cee61f0ddd95bca69d3664c6c8b473d379afcb4a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains numerous external URIs and link farm patterns, suggesting an attempt to redirect users to compromised or malicious websites. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://laborke.ru/uplcv?utm_term=how+to+insert+page+numbers+in+word+2007+manually PDF link annotation
    • https://genia-groupe.fr/images/files/genarededinaken.pdfIn PDF document text
    • https://cupanghitam.com/contents/files/62275152574.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16096acf5835d6---27541499053.pdfIn PDF document text
    • http://emannsltd.com/userfiles/belelux.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/beraxipif.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/89991735697.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/rixisawokolasaxoraf.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16096232988ceb---fupivegubexiturimibajox.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/lilupevafifadevani.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773920dd790---74756480473.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/ag2aoru79ae798eh5hinrq6gh1/60511033097.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607960537f141---witaw.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16074db4fa33bd---66696815723.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/dojolote.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac585e12751---8436031269.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/50578702985.pdfIn PDF document text
    • https://nevisnews.com/userfiles/88460369979.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/74b7be688e0b3d0e8745c80c5c603158/mojewetodatirerevebawiduz.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210628_4AF24037ADA4D8E2.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5aa5396431---poguligew.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/1696c865b086da0ace2a02bad0e74b10/29488492140.pdfIn PDF document text
    • http://temple.mo/userfiles/file/88032987756.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/piwuxurusenur.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/27531509163.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/a4ec118d7500a9085ba135d30321d0ad/bipovapobuge.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/walikumolemipupefaz.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_off0000d8af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AF 11456 bytes
SHA-256: c0c23de053a9dbe9f8f922ab5ee2a9418bb37e86af33e56a2add0a961641013c
font_01_sfnt_off0000f373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF373 17756 bytes
SHA-256: 047a1c99f0374122bd34bdba06b2fd902c644401d0c1fc65a6ac8fa03519a8fa
font_02_sfnt_off00012223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12223 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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