Malicious PDF — malware analysis report

Static analysis result for SHA-256 af2da0ddec2139b3…

MALICIOUS

PDF

74.3 KB Created: 2021-08-18 00:14:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 8aeba6bd589ad626297b786a79cc3ca8 SHA-1: 4ff424f21941a2f63dd18da02cc0a86f7de26459 SHA-256: af2da0ddec2139b3cb9f63baec357fc1a853813dd05f713b9b77bd9bb69e40e6
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely serving as a distribution point for further malicious content. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/m3cd257q909e1t36qbs8l8fsra/96075177384.pdf In PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/00340602f615517975ef8cf249dea6fa/rufonatuno.pdfIn PDF document text
    • http://magnachip.cn/userfiles/file/20210510064425.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b522528cab2---wutukofib.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/87791053791.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/rovuketifagixejupo.pdfIn PDF document text
    • https://whitesal.com/data/images/file/8753_20210519165531.pdfIn PDF document text
    • http://griby.biz/ckfinder/userfiles/files/gokarerikuririmonemaku.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/17361128258.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb370b42e4f---vowimidabutojixiz.pdfIn PDF document text
    • https://primer-spb.ru/files/files/87932082654.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/15b9b68fac5a013455b89e40ea77d62a/76748085864.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/91950396543.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/48846610132.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076688ebb871---dibegafepewabezatabedobi.pdfIn PDF document text
    • http://wonderful-foods.net/userfiles/file/93587552636.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/91445118895.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b48a63cad04---33866925740.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/63373807991.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/5392747003.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/xivukikeduvavemamas.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5735608f8---gejona.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/17974129985.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=durga+stuti+full+path+in+hindi+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_off0000bffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD810 16428 bytes
SHA-256: a86584a432a7c71ad357bcaf84bba4c6eee0ddaa8fa35c2fad2a9d8975b1fd63
font_02_sfnt_off00010191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10191 10832 bytes
SHA-256: aba58072678ad2367af1a31c9231ea6605709489735ae8f3fc95046bf9bd7760

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