Malicious PDF — malware analysis report

Static analysis result for SHA-256 3848975a274b747d…

MALICIOUS

PDF

83.8 KB Created: 2021-07-30 21:38:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4f2e604c55f427d8943a4ce632e131be SHA-1: b123999313e0a0e76d5f99d5676f4b7ce24fdcae SHA-256: 3848975a274b747d6f874c528cc90749984740bb87141ac9dd2554d5625ac40f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external resources, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/dbd5f73549526ac2b5164dc8bab84558/lifunuzusozikoropopudep.pdf In PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/910571039bdb99df949e981163764427/jevusesazejiti.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/mifefawusajigowil.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/d59728c02a3519ad4131e00847a2066d/nekusozemilon.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609544b9d855b---mudapivimoma.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/davokafuxoxovusored.pdfIn PDF document text
    • http://hubbardfamilycircle.com/clients/62940/File/figudobokazokadodinonesaw.pdfIn PDF document text
    • http://tuhs1970.com/clients/a/ac/acc339db084e87cdfae31a76a6c96f1c/File/totemo.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b5faddde8---67709559873.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210717195328519.pdfIn PDF document text
    • https://sca-kc.com/scauserfiles/files/fewolopelivuni.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee6ce78cc9---7129485474.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/2011605605.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160821956c7c35---29494257243.pdfIn PDF document text
    • http://fst-uinsu.net/userfiles/files/1107310838.pdfIn PDF document text
    • http://hillandbrownfamily.com/clients/76964/File/zategasudosuwu.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cca85972e10---vaxoronuge.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/zitafoxaletugaxu.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/vizow.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/36052610740.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/4e6a5cd170fb5d84efbb637272e62ba2/11703175621.pdfIn PDF document text
    • http://simpli.ie/survey/userfiles/files/23378647272.pdfIn PDF document text
    • https://mszukam.pl/dat//file/44004468780.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/ridopawarukowo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+install+roblox+mod+menuPDF 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_off0000e0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EC 17768 bytes
SHA-256: 147f327e4f9322e7b88e35bddbf43942beef400d4cbc86a7aeeae54832938313
font_01_sfnt_off00011030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11030 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12847 10828 bytes
SHA-256: 9a64edc508d0bf340c805b79a3b9ba12c4f17c085d429b42de8a6d3b201eb0df