Malicious PDF — malware analysis report

Static analysis result for SHA-256 7df788533c0379a6…

MALICIOUS

PDF

80.1 KB Created: 2021-09-13 15:52:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7ed678698072c734fc104a91f90e4c73 SHA-1: b8b633d93173f075db9df4dcf9d08c81f356c203 SHA-256: 7df788533c0379a68868b38dc1a45c835bd4f549f86ba0a261914e8682993a69
164 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to external PDFs hosted on potentially compromised websites, indicating a link farm designed to distribute malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fopodukodegunazajexomo.pdf
    • https://sieuviet.net/webroot/img/files/417467982.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613164d66c7a7---49022197783.pdf
    • http://ctkupavna.ru/upload/file/90973971063.pdf
    • https://marmetal.cevhertemizlik.com/userfiles/files/76130774967.pdf
    • https://hinaweb.com/upload/file/72602934745.pdf
    • http://eltprof.ru/userfiles/file/66701449524.pdf
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/nuzupovovabirasop.pdf
    • http://brilsports.ro/userfiles/file///pabusagugawoto.pdf
    • http://scard.vn/app/webroot/uploads/files/79035292857.pdf
    • http://fractinvest.com/uploads/file/bufiwebufawutit.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1d2e379c0---53206978895.pdf
    • http://ylpqzl.com/ckfinder/userfiles/files/fevekopegofoludafu.pdf
    • https://collinite.pl/userfiles/file/tagikolelenikub.pdf
    • http://feuerwehrobrigheim.de/upload/files/2338611628.pdf
    • https://ventadeterrenosurbanos.com/userfiles/file/68060417279.pdf
    • http://stepasidemedical.ie/images/uploads/file/vorozulirujixa.pdf
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/lojomuxoxodibojoj.pdf
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/roxegopojevadixu.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/37a5d3f1d9a58c2b8ab02efed1c7cfac/62756697547.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/161376b5723cb1---24807592242.pdf
    • https://catwalkdogcome.com/editor_upload_image/file/65579869376.pdf
    • http://pileshoppen.dk/userfiles/file/38062904406.pdf
    • http://geometramaurotozzi.it/userfiles/files/30981995926.pdf
    • http://cateringkieuan.com/uploads/userfiles/file/fasibu.pdf
    • https://istanajpdua.com/contents/files/sopal.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=fortnite+download+for+android
    • 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_off0000d4c6.bin
5f917fc20a33fc83bb42745245ef1c857dc31ff6d364bbf985bf706a7288dfa2
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C6 10244 bytes
font_01_sfnt_off0000ebe7.bin
a7349b9b98b48005e9ba3392d866f59d1db3c5b77b9546536b379febff1fbf31
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE7 17876 bytes
font_02_sfnt_off00011a64.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A64 16792 bytes