Malicious PDF — malware analysis report

Static analysis result for SHA-256 0824dd32fa488556…

MALICIOUS

PDF

194.6 KB Created: 2021-06-29 20:19:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 638ed6c239b43ac448e71e16e101aaa1 SHA-1: ec376b5979bf1126f2ced0feb8f006847c663f16 SHA-256: 0824dd32fa488556271a5ae4b15d4ae95057d187e65ff2039ff431fa345926e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9666

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://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/6e6a2864bc5a2719a6f669c64d808f1f/97806387350.pdf In PDF document text
    • http://fondationmonetoile.org/clients/0/0e/0ecfe6182781ff486fe5156d2e85c11d/File/57116782621.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/tixojewukoleder.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202106081952.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/1e4e8e2110e584b33e1a9271159b5b1d/7117261707.pdfIn PDF document text
    • http://fbchitchcock.org/clients/8/8b/8bdff38a390027835eb24981312b950c/File/wovexefu.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/vej0qlr0pvv3goohihslg4tqg3/movetinabatam.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160bcda43cfcda---56103237294.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1607bee6b45e24---mefemosoz.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/7936786075.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cdaf8e2214f---55015567987.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/25ba788334211e0b224bf9a4ff901ae9/91897885379.pdfIn PDF document text
    • http://allycatering.com/userfiles/rewezeleluxibax.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/reginekunol.pdfIn PDF document text
    • http://skikk.eu/app/webroot/files/userfiles/files/1604329119.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/gjrfu2tdcq8iu9epqul3e940v3/15039349268.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/66765549820.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/c5bc4b239641c9d2b3b13016fe96a72f/xasamokepe.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/2974ba57e95d953eb5e27249f103d6d8/91473898631.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/timanukekajoredetexu.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607e797203746---51314691857.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc121b7efe---xesobesekim.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/160821be80528a---75769853666.pdfIn PDF document text
    • https://steammining.com/userfiles/file/kawulojirefinotixemuk.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/2abf10182427178cfbf290a06128810f/69756447812.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=let+us+come+boldly+to+the+throne+of+gracePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000270d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x270D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000288e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x288E1 16100 bytes
SHA-256: cd995502891255dfbcf4afd28e083ab8bfc87dc57603266f4586087dd25ac3fe
font_02_sfnt_off00029e3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29E3A 11144 bytes
SHA-256: 710fd966a77280ee51f4988848f9ae0f0dac892878ee1a95fb58758c66107e42
font_03_sfnt_off0002b7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B7E5 32060 bytes
SHA-256: 61ba1ed7e9cd8a3d80593aba54a88dcaf1df0adfb41f8dafaea2f2a3c280380a