Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1022854f71b54b7…

MALICIOUS

PDF

72.8 KB Created: 2021-09-27 13:49:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8b1533b6f935cd731480f7aee94703dc SHA-1: d5e32a8e716b3c3f10300b4b41f23ffc8b05749e SHA-256: c1022854f71b54b7502024b25d70396e48000662e787bf17d334df6d77d6e8b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 https://jsptti.com/ckeditor/ckfinder/userfiles/files/7125048313.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/54357f6af8667b7b76cce994f39e99c0/numojomipupemum.pdf
    • http://scandinavia-ex.com/images/blog/file/78018599609.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16150d08b40e19---jumamovawafezuzofolug.pdf
    • http://megalaserasia.com/upload///girazafuzudunigezawajobo.pdf
    • http://ehomeforeclosure.org/images/file/43966364637.pdf
    • http://solyaris.pro/admin/ckfinder/userfiles/files/motaviwefeziwojeninigaf.pdf
    • https://laatjehuisweerstralen.nl/upload/file/jisosurajopipazib.pdf
    • http://istanbulballoons.com/ckfinder/userfiles/files/lupijukisa.pdf
    • https://intersensor.ro/v2011/Files/fck_upload/file/70738689109.pdf
    • http://www.peritaonline.es/ckfinder/userfiles/files/11036524352.pdf
    • http://tks-forever.com/upload/2021/09/06/file/76314467364.pdf
    • https://nmcs.ca/userfiles/files/99569698306.pdf
    • http://nadiadsa.org/userfiles/file/76718672206.pdf
    • https://dolmalatrek.com/userfiles/file/55088985430.pdf
    • https://blogsma.com/files/80894404025.pdf
    • https://heritran.vn/uploads/news_file/xezulipelebibugu.pdf
    • http://snuhonors.com/userfiles/file/xapinuru.pdf
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/18924649720.pdf
    • http://eg-connect.com/uploads/editorfiles/file///keparojeji.pdf
    • http://cistenivytahu.cz/upload/file/36889761754.pdf
    • http://toanthinh.vn/webroot/img/files/78721469270.pdf
    • http://www.somdattabasu.com/fckimages/file/goniladuw.pdf
    • http://jingkangchem.com/upload/files/nilijigisusirupi.pdf
    • https://uat-tunisia.com/userfiles/file/60436471658.pdf
    • http://klpa.net/userData/board/file/zaxemanubisadepuruluwib.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161436bb15e875---jamexesuwitotapit.pdf
    • https://aawyx.com/sites/default/imageuser/file/velenaxalijejivele.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=install+alexa+app+on+iphone
    • 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_off0000b9e5.bin
b4bbc61bf0b3c663dceae61c598d3ed3cde4481aae5762da455f384cacc05928
pdf-font-stream PDF embedded font (sfnt) at offset 0xB9E5 17240 bytes
font_01_sfnt_off0000e61e.bin
ec3c3d7f816721489c882cc9388a82348f15c53bb1e4eb9de72358d0e42a7895
pdf-font-stream PDF embedded font (sfnt) at offset 0xE61E 10304 bytes
font_02_sfnt_off0000fd46.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD46 16792 bytes