Malicious PDF — malware analysis report

Static analysis result for SHA-256 4080ffbece44398a…

MALICIOUS

PDF

78.1 KB Created: 2021-09-20 19:00:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 90307894a33fb9e293ff4442a0e7b31f SHA-1: 12d75c3f28bf3d676522868cd850f45c33ea7511 SHA-256: 4080ffbece44398a4b3d80eee5f150e6fc170e369b2b09303c09abbf7438e05e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to disposable hosting or compromised CMS uploads, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection or execution of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inwebjor.ru/uplcv?utm_term=triceps+push+ups PDF link annotation
    • http://gardensyellowcab.com/admin/images/file/97524868695.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/rujixebimageroloj.pdfIn PDF document text
    • http://greensquares.in/userfiles/file///65942785061.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/47208131002.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/wikerud.pdfIn PDF document text
    • http://canadianrockies.info/files/file/45947477335.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/wogexewamugekugexun.pdfIn PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/lidedilulukowad.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140d4c77980c---32603702494.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/974874288.pdfIn PDF document text
    • https://www.pollackmihalyiskola.hu/ckfinder/userfiles/files/bevupadalowipobibimajewe.pdfIn PDF document text
    • https://tebra.si/userfiles/file/nofiwipobodumipo.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/94656980300.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16131abd3c22bf---wozumawuwojelinevamofug.pdfIn PDF document text
    • http://kidzcastleschool.com/singhania/downloads/file/pirupibetesirumatowale.pdfIn PDF document text
    • https://herfection.herfection.tw/upload/ckfinder_temp/files/20210905120229.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161385e8462d2a---59279089612.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/55209623473.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a604867eb3---91083080473.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/73561200102.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/93777792583.pdfIn PDF document text
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/9814929253.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_off0000d0d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D0 10004 bytes
SHA-256: 84b863a78bacbfde3412f6d1d396aa4c6b01942d613e00ebf43da6fe10b97bd7
font_01_sfnt_off0000e71d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2F 17296 bytes
SHA-256: 8bc5209ffa464cc3d647bd784233b9e7631bf0e7982d05fe46168a87ae9fb231

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