Malicious PDF — malware analysis report

Static analysis result for SHA-256 b391a689112b3f2c…

MALICIOUS

PDF

71.7 KB Created: 2021-08-15 02:06:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3be23ce6d5fedc43dd48dfba516d843f SHA-1: 5d8bcafa0215587342fb95a8ceb1650037d50237 SHA-256: b391a689112b3f2c5942a6b318883e157e56033798b96bbfd8cddafa2d702276
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malicious files. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to obscure the true malicious destination. While no scripts were directly extracted, the structure and heuristics strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://newfieldclassof1982.com/clients/6/69/69e49ffade321d977af769e13f9f004b/File/94644867372.pdf In PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077375ba3440---87398567575.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7fe5abdec---tuxowugorafesif.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/fijabilubanabowo.pdfIn PDF document text
    • https://groupburuemas2.com/contents//files/soreritesixofipadanevo.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/62303578902.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e822526af7---poguvipebow.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/bomavatibenigefaxowuvedo.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/009baa0c47abde984ee9be2ce026e208/80791384766.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/51835671168.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f85623d95d4---penuwedadaludorumorigek.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/4000913113.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/liduduvanivupojameresag.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/57634920199e8ce81506f097e3085d5a/xovov.pdfIn PDF document text
    • http://foreverymuslim.net/home1/forevev3/public_html/foreverymuslim/upload/file/jevid.pdfIn PDF document text
    • https://norservis.info/files/files/tapusapive.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/b22276a39d559e425727b18ed7ac776b/nekufalidejevuwaf.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/87c9b3dde51c78fd49039d9f0af29069/95028928801.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/42824561675.pdfIn PDF document text
    • https://amgaa.org/temp//files/31135709805.pdfIn PDF document text
    • http://ural-kip.ru/admin/ckfinder/userfiles/files/94091058618.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/bbdc8dfd61335bef0f9af8a9da4115eb/toxosagisirelibogiwoke.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/95792938350.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/67541937768.pdfIn PDF document text
    • http://littlefreddieking.com/clients/65037/File/zubixanisanomugenexezom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=heartstopper+volume+1+pdf+downloadPDF 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_off0000b7fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD010 15804 bytes
SHA-256: 772f2ffc946f6ed1f4f91014c434a300f966d1796b626e802f2730017f5c6ca3
font_02_sfnt_off0000f84b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84B 10860 bytes
SHA-256: 6c72d978172f4d88f043b10e1a5f0de7d79ff3987f32b688d71f19afaf5eeed3

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