Malicious PDF — malware analysis report

Static analysis result for SHA-256 97d783ac1ea45c29…

MALICIOUS

PDF

77.8 KB Created: 2021-09-07 23:11:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 4450f3f4bcbb4d7de326a3e8ced7a0bc SHA-1: 8e2f37604ca8f93d34d71e06cb41de0f894d359d SHA-256: 97d783ac1ea45c29fa0a56a2626b5c3b2f48d8ee728de97376fca57d11993a3f
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • 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.
  • 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 http://yucehukuk.com/resimler/files/dodazaderisaparulotel.pdf In PDF document text
    • https://bio86.net/fichiers/buwinozuk.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/3vgeb1rvm6f6abimvrt7f9pq9k/koraxaleguditu.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d06aeb33d5---jipejirojom.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/mekijugiruzufurotixosutom.pdfIn PDF document text
    • http://cocoabuterol.com/upload/files/kuvejoriluwe.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16088f94d43c59---37181018401.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611bf5d902276---xijukawelavorepasenekoma.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210627114813.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe86ea7a2c6---penololesusurigupaxogetu.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/2f84qe6tgv8u6fn5jo2b8kdbai/82784150906.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/losumibivegepofigebot.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/rominegob.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606da013c28bf---damepinupifesapopig.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/jg73cnjv0uo8r8mal68emdlu52/58326598140.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/50984013935.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e324401a89---padaxanawaravorixib.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/kimikazemamibepob.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///835213202.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/6367878563.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/53026446134.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611615ec36a0b---tulozif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=ibps+po+pre+question+paper+2018+pdfPDF 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_off0000c734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC734 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF46 18676 bytes
SHA-256: 8b70eefa385242d8c638aeba4fcabe3a29b317c8f517534df3605b61e686dbe0
font_02_sfnt_off00010f92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F92 11284 bytes
SHA-256: 3e7dde41039d6d539e2e2eb840106df8322655a5e010e71230fe5f2916f9260f