Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6a4299dcf6d4131…

MALICIOUS

PDF

88.8 KB Created: 2021-08-16 09:15:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 50ee94221e2ac90bd1d4c5bfb823c7e9 SHA-1: 30d111092b734de14fba3fee54f6828215b2b29f SHA-256: d6a4299dcf6d41316708140e4923ff84dad5a1f09243fd42e6a60c95ffc3265b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads or disposable domains. The embedded URLs suggest an attempt to lead users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oilandgaswork.com/userfiles/file/79328900500.pdf
    • https://turkihale.com/userfiles/file/74968553801.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/7f8280b0e91b23a2ec4d1de0a667bae8/jevuwuxug.pdf
    • http://maternites-catholiques.org/ressource/site-image/files/89529471233.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d511b3247a---64498221352.pdf
    • http://tranindo.com/Uploads/userfiles/files/58374730419.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bd1324153---nekurakaja.pdf
    • http://xboxheerlen.nl/userfiles/file/negugimesu.pdf
    • http://txextremecarts.com/userfiles/file/joxolezikemoko.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2994edba49---61316733123.pdf
    • https://agrimal.pl/userfiles/file/rakan.pdf
    • http://novastal.pl/userfiles/file/kiwopopeg.pdf
    • https://habibitours.org/ckfinder/userfiles/files/94646196392.pdf
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/5tnrjboop5q6mf88ddn4tkro7p/zedanopukuzafimozamijafis.pdf
    • http://ymjgolf.com/file_media/file_image/file/lupizu.pdf
    • http://sallytour.com/FileData/ckfinder/files/20210721_D7AE6EE0A7B06935.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/37e0ffed20dc5c7835bb2a8218b98338/99134987277.pdf
    • http://murielbellhomes.com/userfiles/files/pesele.pdf
    • http://www.leasebridge.com/CKUPimg/files/17205391092.pdf
    • http://kxzyjy.com/CKEdit/upload/files/33979407860.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/28c0e12c94c8184d6fd39a8800401370/ziniwugufegaxuxusa.pdf
    • http://www.ruben.pl/ckfinder/userfiles/files/tewunu.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/7e2f5520a1c73b575f73cb90ba5a6bd1/5121797906.pdf
    • https://hijaulumut.com/contents//files/11430330676.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=theory+and+practice+of+counseling+and+psychotherapy+10th+edition+chapter+1
    • 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_off0000f144.bin
252b6b3270fed62287326d360c9edae883c6de3893e286869ee9fea200b92fde
pdf-font-stream PDF embedded font (sfnt) at offset 0xF144 11252 bytes
font_01_sfnt_off00010b76.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B76 16792 bytes
font_02_sfnt_off00012388.bin
eb5f8d1944cfd18b325a144ef424277fa33f90ba76f28bc179464336cb3e23a4
pdf-font-stream PDF embedded font (sfnt) at offset 0x12388 19148 bytes