Malicious PDF — malware analysis report

Static analysis result for SHA-256 fff7d32557672a89…

MALICIOUS

PDF

85.8 KB Created: 2021-07-02 14:13:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 36dae20c1dc279bf36b55280cd291d46 SHA-1: 7a8609f58030c9fea2a72d6dc4fb7ffe5b2226d3 SHA-256: fff7d32557672a89a6b5ef42445ecc3bb13271cdaf6136ba3051f1cf40c84e97
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely involving exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • 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.
  • 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://pistant.ru/uplcv?utm_term=the+kiss+1908
    • https://parklanehotel.asia/userfiles/file/1868430399.pdf
    • http://phantasos.org/userfiles/file/79521675467.pdf
    • https://mdteam.se/ckfinder/userfiles/files/nutigovenoxixajonaped.pdf
    • https://gites-les-bardots.com/userfiles/file/gusalusisujekisafufu.pdf
    • https://agrimal.pl/userfiles/file/74789708957.pdf
    • http://arkystudio.eu/userfiles/files/luwinigo.pdf
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/9cfcbe347c5e59c3b0f9c85593e16ad1/65780973534.pdf
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607bed605d2ff---wikipuxomefoligixaber.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/5f200e134cf37fc3d79bc8928de9234b/38680657038.pdf
    • http://whsclass1968.com/clients/f/f8/f849445bb2fb8f42e7c863050dc1ba38/File/20777179988.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16096140606eed---rutadelijutipaxogasuxo.pdf
    • http://epmachine.ru/d/files/senuwewopatu.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa2b99f5cf---rujepojepomez.pdf
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/5ded70402f248bfdc011a0d29cfece87/22526242388.pdf
    • http://fallsplat.se/file/6900404486.pdf
    • http://passaicvalleyclassof1957.com/clients/44362/File/tefabaluwazut.pdf
    • http://dytac.hk/userfiles/56805544465.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c784cc5c7---sageb.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/da2af24c35878ac9d21998f8f0bcda03/82140999123.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608258562f7f6---zivudetinuwuz.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/5abd085be5c3a8fb2325f7143c07a536/17091802009.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/ac288bad668fa82b63e2cf8b9941de96/dogedav.pdf
    • https://hostessima.pl/userfiles/file/soragoniginunawodufofun.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f246061f35---84450436827.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16091a3fcd363d---rekupudugezo.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6975546db---duxoluxinaxu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef6c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6C 16792 bytes
font_01_sfnt_off00010783.bin
5da0bac4e4013e1b5fc0bc33a7edd403d0c839abd9500ce9f87250bde66ef2bd
pdf-font-stream PDF embedded font (sfnt) at offset 0x10783 10180 bytes
font_02_sfnt_off00011e7f.bin
bbb7fb2140de9929f53ee5beadcfe8d9775d182bc4e2f8958febc714a47ec8ce
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7F 16912 bytes