Malicious PDF — malware analysis report

Static analysis result for SHA-256 de95d87d32882fea…

MALICIOUS

PDF

107.2 KB Created: 2021-07-24 22:48:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3b2b1b1256d3c628c04ba7d72e7cb391 SHA-1: fec721d3052adaa6f1be6e96ccd12cb58626b85a SHA-256: de95d87d32882fea917540f9e69bc492a6477195dd6c9e44515261e00b8acf3a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, multiple heuristics indicate the presence of link farms pointing to external PDF files hosted on compromised WordPress sites. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of this file. The embedded JavaScript likely serves to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9630

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/5acbec5a84df1794a5ba8863145e1d20/47848848199.pdf In PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160727ee674799---53732443808.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/subevovebemokebepodinola.pdfIn PDF document text
    • http://skomi.ru/img/files/file/mamezirifim.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/dntjlbq4the1c1tb6ihtoj79m5/71208082780.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c282e560ef9---pesenelazukegadodano.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/66625137709.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160fc157f96898---52208918036.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/kulivuxosizibafikapuwa.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16097d87b4b9fb---jekexipivogomivedi.pdfIn PDF document text
    • https://jslt.site/js/ckfinder/userfiles/files/50404603080.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/56129728934.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16074ca417cdcd---vavipisajezis.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/7780661445.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c2bd77447---misusoresudefigepozuten.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/lenuxivojite.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff0fa17b59---81606424994.pdfIn PDF document text
    • https://wagaskar.com/media/xusopepikosoxa.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/kuxawarodoluki.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/3a9606318ebbea62f450ef7eacbe171f/41992492249.pdfIn PDF document text
    • http://tele-video.ru/upload/files/daxixexirusisu.pdfIn PDF document text
    • https://chris-arnold.com/userfiles/file/40152523803.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a4718ae7b---jafenadekubolenof.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/82091990655.pdfIn PDF document text
    • http://st-communications.com/ckfinder/userfiles/files/wapededigodineb.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a16c620be4b---kifowomileku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=redhouse+almanca+resimli+s%C3%B6zl%C3%BCk+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011db6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB6 16336 bytes
SHA-256: e38e65b0ba3a3d5522155d7d20f1c179bb975df8e8b6857ce7e47dbbafe63690
font_01_sfnt_off00013416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13416 21924 bytes
SHA-256: a11f7a309614bd6193d73081b5ec21a73d9545495b81c7b4f26de86b3db6e08c
font_02_sfnt_off000169d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169D8 11492 bytes
SHA-256: b1f78d15c4cf3ed0ac3723018b687b4be8df71b60c57fa3fe9f16cec48aa567a
font_03_sfnt_off0001840a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1840A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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