Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fbb0f392174d9ee…

MALICIOUS

PDF

79.4 KB Created: 2021-07-30 12:11:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e87ce28d2b0a2512954ad792d6b37a6c SHA-1: 8d380ad33a1cb7ddbc5e057339bc8e3d4ed2688f SHA-256: 6fbb0f392174d9eef50a0d16d757efd34a456b91f71744e91f29e6221913c48f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and ClamAV as malicious, indicating a phishing or trojan distribution attempt. The presence of numerous links pointing to compromised CMS uploads and disposable hosting suggests a link farm designed to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing lure, likely intended to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://sherwoodchamber.org/ckfinder/userfiles/files/34122688839.pdf In PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160ca309eb15e3---17127535684.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ec436aa60ed---mewawosokes.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/97205375035.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eaae254d96---11585701396.pdfIn PDF document text
    • http://backyardreleaf.ca/clients/6/6a/6a4eaaf8452764cb6fc14c9064ed0c71/File/9034040129.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/3fc1effddbccae8f37f587ee887dde78/76281081699.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16083b122daad5---13742699785.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a0c853d80---89324089625.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/93967944634.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a01828cc07---27017168498.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/wadeloxokebasugudabidesup.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/rekixijumogexivisewuj.pdfIn PDF document text
    • https://www.propertyadvisersaustralia.com/wp-content/plugins/super-forms/uploads/php/files/01b8c15cbe15e08df3a60795c8fec033/71007408107.pdfIn PDF document text
    • http://graficaeformazione.it/userfiles/file/fulekulemobepavutil.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bf5662021b9---jokuxubutejojuz.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/28663879576.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/956noc2dvef1630lnpcl1rh224/72344814988.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/siwamapixi.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/1155030729.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/8i16p434succ8i47t8impv6o09/10337405997.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/l5ent2kbfc2grm2r9u5l06mpje/73939520814.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/b4bjog4to145uhqqcjs2qomha1/xoguxakataxiralodarafag.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/7e780d0bffe362fa739b6e57873a3f97/8606264890.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/24568249229.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=download+film+ada+apa+dengan+cinta+2+indoxxiPDF 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_off0000d328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD328 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3A 16632 bytes
SHA-256: b3a1a24e72f808d9f2d7ca94f56051ac32dc55b3068a853c086735dec0173d05
font_02_sfnt_off00011695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11695 11004 bytes
SHA-256: 9bb57b7901e188815070774fb8ffd23c908e138c6eb9ca891c46d4807362d3ed