Malicious PDF — malware analysis report

Static analysis result for SHA-256 82c083d68d10e5dd…

MALICIOUS

PDF

79.8 KB Created: 2021-09-19 17:03:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 45e3e37b6fd95163697dac71a27d9952 SHA-1: 0dd8eeb05c8b54b12622a50f33d1164d2f0cf18c SHA-256: 82c083d68d10e5ddedad377fbd96d03eade0ef21b7b16356fed5db6f8115c62c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern involves luring users to click on these links, which are designed to be non-obvious and potentially lead to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://cascinamana.it/userfiles/file/papuzo.pdf In PDF document text
    • http://insightonafrica.in/userfiles/file/21419902496.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137cb55f3705---sajafo.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/somivoditijisiferi.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/xoduxufitodenunomadofaje.pdfIn PDF document text
    • https://herfection.herfection.tw/upload/ckfinder_temp/files/20210904012814.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/72990418667.pdfIn PDF document text
    • https://kiptep.ru/file/89508260960.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/45572704976.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/59587350497.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613349b823c4c---dixijexikizodatu.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/4990004547.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1841cab25---86208018421.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/zizumekiwumiled.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/xiziperukon.pdfIn PDF document text
    • http://80tner.friend-match.com/upload/files/40868824968.pdfIn PDF document text
    • https://strings97.hu/userfiles/file/kopuzipuwibeb.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344fac20b7d---58830648506.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/fupejaxowek.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/c9046f249f8e19a82737e439754c7930/xegozixajowuz.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/50369105355.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/27061128105.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/xuzaxilufore.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16136630db0147---tijifigovul.pdfIn PDF document text
    • http://lednotice.com/userData/board/file/puranufovovusipuvi.pdfIn PDF document text
    • https://lasanisports.com/files/98390811608.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=beyond+the+mountains+and+hills+2016+watch+online+freePDF 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_off0000cf15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e72c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72C 11556 bytes
SHA-256: 34c9c3db776adc280281c4fc58b26424b0bcb696606de907c7f31cbfd8061e46
font_02_sfnt_off00010291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10291 17980 bytes
SHA-256: e9f2265bca958c9bafa81a7b0bc6dd0489a5a479a4a3261cf520a07c2f776b15

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