Malicious PDF — malware analysis report

Static analysis result for SHA-256 8629530a9113b8f4…

MALICIOUS

PDF

85.0 KB Created: 2021-09-14 02:13:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3b9529dd96ab9b39f20d945380e2698f SHA-1: 81233ad74110f5eddbfa089688ab388d7ac4d57d SHA-256: 8629530a9113b8f4b2e03d3bef611bce18a81633ad4258b0dc7c19b94980dfc0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF with embedded JavaScript, flagged by ML classifiers and ClamAV as malicious. It contains a link farm pointing to various PDF files hosted on potentially compromised or disposable domains, suggesting a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the redirection or execution of malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 http://tsradviseurs.nl/mailing/images/photo/file/deduvategekonatesokipelu.pdf In PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/63479996910.pdfIn PDF document text
    • http://naturalfurnish.com/userfiles/file/85714403804.pdfIn PDF document text
    • https://recrut.com/files/files/kopovosepizanivuxasizoluf.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/10286074784.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/0473a14b732327ef1776cfb1ffecd320/majupip.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/vuduravomix.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/99686586851.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/95652911824.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/55437556910.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/2008197408.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/xumitaxuvujate.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/mateb.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613281644b6f0---22941296921.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/98101599198.pdfIn PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/nitezuwezurulejoferib.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16132c52971c5b---kexaro.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/87007351106.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/tanadezasefuvim.pdfIn PDF document text
    • http://pegastelco.com/pictures/files/57401973471.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/kukamesajuzuvo.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/23095803893.pdfIn PDF document text
    • http://haliburtonhighlandsheritage.ca/userfiles/file/75914369296.pdfIn PDF document text
    • http://talani.nl/userfiles/image/file/38473512416.pdfIn PDF document text
    • https://photofetimages.com/torekipajukamu.pdfIn PDF document text
    • http://stl-hk.net/userfiles/renese.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=tu+hai+mera+sundayPDF link annotation
    • https://lapdonline.org/file/14599476393.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_off0000e683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE683 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9A 10428 bytes
SHA-256: 7f524fb229b5890ff3fa1aa91f1de6902a3425ae3793bb06723070125cd8dd37
font_02_sfnt_off00011600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11600 18460 bytes
SHA-256: 40c9a50e41165463bce0565b7257a2cafe8996f32b089395a6165f6be1f8fad3

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