Malicious PDF — malware analysis report

Static analysis result for SHA-256 593dbf409d2d9924…

MALICIOUS

PDF

92.2 KB Created: 2021-09-05 01:38:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: afc9e8bbf29d7820af5863f607b57ab8 SHA-1: 6bf134385bfcb821b4b465ca6aa038a37b7bb4ce SHA-256: 593dbf409d2d99241dfa3e22ad792620452d2570b4d8961a37acc07eb6c6afeb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to exploit vulnerabilities or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://oniceh.ru/uplcv?utm_term=avr+risc+microcontroller+architecture+pdf PDF link annotation
    • https://alteanetworks.fr/img/file/kerowalelu.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/35399836680.pdfIn PDF document text
    • https://akgoz.zemta.com/uploads/files/1617267844.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/zojuwepawabekexuvibe.pdfIn PDF document text
    • https://midasspa.com/ckfinder/userfiles/files/venukuwupusokug.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6333d5f208---14346452133.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bca9fc617d8---bavodawupetup.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/17m15j1k3u13tcjs1m84h5a9au/gagodenukaj.pdfIn PDF document text
    • https://gangnampools.com/contents//files/49300555643.pdfIn PDF document text
    • http://vigova.com/Images_upload/files/87566032010.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/cbf604004504cc96c7039fac021141ff/roxudigisiwapero.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/sowibapefinibij.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/widejakenekujojemiros.pdfIn PDF document text
    • http://canoto.us/Images_upload/files/78577256242.pdfIn PDF document text
    • http://olympusflights.com/files/files/gones.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/69816133680.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/meruvalipotisaziwe.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16095bddbbde1d---gikuwivifo.pdfIn PDF document text
    • http://tjtvina.com/Upload/files/nelotetote.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210824200352.pdfIn PDF document text
    • http://pengyou-english.com/FileData/ckfinder/files/20210724_E55F1D12C2C8037C.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e94b573827---66448309303.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c79e7b439d---welaxawixupe.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/jilanodokawimugijud.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/41550841144.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210604_35DA64E5FE9A3301.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_off00010280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10280 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011a97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A97 11032 bytes
SHA-256: eed74343cbd274e49a679208ed597f02e60b973ca01db8e336c639bcdf97d899
font_02_sfnt_off00013410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13410 17952 bytes
SHA-256: 9d4a876ba6dc33f8dc599ff621862648af88c853ccb1bc92003ac8a844866b7b

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