Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3995e85a6b86136…

MALICIOUS

PDF

82.6 KB Created: 2021-08-15 18:57:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 811697c558408f08214754e3cf4e6e0e SHA-1: e207757900e9fbc8a5a4d2f0904d0618f2b89260 SHA-256: f3995e85a6b86136bbe9c640f10b686833683ab0ab024de5e7e378ef640566d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://studiotecnicofrisoli.com/userfiles/files/xosuleduzafedapif.pdf In PDF document text
    • http://pphjako.pl/userfiles/file/lesoz.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/jovesilusopuxiriv.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/14vjgrls4a07r1ics1do2soodt/42157631576.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080fbc4e24aa---bubiwadeguxuxenav.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610bd31ea5692---19793069243.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7f30882b2---90308507388.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/cio7k51665329bm51fu0m1jos8/95281020913.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/zifibezisujedubi.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/taborofogeraro.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/nipuvagotakipuru.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/93757103863.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/6306037990.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/rowuzinugogem.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/1ea2c44fd3504739ce3152831d61b913/delojo.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/sanirogijugufiketokutij.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/38959559411.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/guvolobikelupaludimi.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/wuwoxunupobewexijixike.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a124715dddded4ae7da641fa0daa9b97/62841600392.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/52aleorvj6td0mmarpa1606243/93423990923.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/oc84gsgl977df9lk1g1359dds1/lijanisuviraleriwufogo.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/9236c9754b1d7ef0124d64e17bf2a8bc/41978830010.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/60b6c11078ca4.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/tvc3d6pccpks6g4g3u1na0gvd3/84913770256.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=personal+swot+analysis+example+essayPDF 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_off0000dfdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDB 10716 bytes
SHA-256: 8bf2be5e50440825c7e195551e4a1b7445534d6fb3a46693f007a30b3b99804f
font_01_sfnt_off0000f88f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88F 16604 bytes
SHA-256: 1683a2b3acdf36c26b7e22ab8df46917786ab6b4c8baa3fd9b262400ec56bb1a
font_02_sfnt_off000123d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1