Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a699af77b97a830…

MALICIOUS

PDF

81.9 KB Created: 2021-07-01 22:50:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e3f78b52fb44decd6e22e534f2cc739e SHA-1: 9e0d6920cd5d6b2bcc1f06c6a53d1955bbd5a1a6 SHA-256: 6a699af77b97a830b76d89045d44187168073b3ff0ecbac40b6648ea6f14866b
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The presence of a 'password-protected archive lure' heuristic further suggests that the document is intended to trick users into downloading and decrypting a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 https://smidgel.ru/uplcv?utm_term=total+english+intermediate+student%27s+book+pdf+free+download PDF link annotation
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/j0u36a0csij2sl6gbh9ib7e9f5/giravawu.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/10647652022.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-1/20210501034901211508.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/gevovawis.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/86d29d75d56651799dca95778690bc13/31299396201.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/gujorit.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/41251802018.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/35214602378.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/8792db4d6a0abb54912046757ac42137/rujutoruwurodiwelexe.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/mupuwabetesixi.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/6d12a3e485fc26e105852ecc945afdd1/19292322969.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/49616617851.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a8370e64a7f---8897491458.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef432a37d0---riripezaxunes.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/zufifilunegop.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/gosedamemavisabuvil.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/17306775291.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/d1i1nanqn58ibts36v7sqng38t/79935205306.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b340fa55934---97045071247.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160be6a923a376---lukul.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/f97982242c9decc595650e30f2344f9a/kasezizujedomijovevaw.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/84344f22673ea0ce1e5b659cc098b5b7/fepegamuvijejil.pdfIn PDF document text
    • 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_off0000d4df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DF 19700 bytes
SHA-256: 4d6b80fb2f3be8b4c7c3d574c2ebd5da42a67b9f5af79f1f9d54f1449deedc64
font_01_sfnt_off000105ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AD 11360 bytes
SHA-256: 2483439b48bf43c75518ce1b7bfda2b664e31dad874b969519e995ee093946ea
font_02_sfnt_off00011fea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.