Malicious PDF — malware analysis report

Static analysis result for SHA-256 db8e757c1944e4af…

MALICIOUS

PDF

83.7 KB Created: 2021-09-02 08:08:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2a9bf7d4ac8868d8147fd4fc6d7e5c7a SHA-1: 8d44e7f93b801a956f71a377b3915eaca95be032 SHA-256: db8e757c1944e4af820ef531facd5840cb65f7d004d62ccb28e8d347068391f3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for malicious PDFs to redirect users to external sites. Several heuristics indicate this PDF is part of a link farm, likely for phishing or malware distribution, with multiple URLs pointing to compromised websites or disposable hosting. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for delivering a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://crewmak.ru/uplcv?utm_term=made+easy+power+electronics+book+pdf PDF link annotation
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160fa05a9e359f---53645248796.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/75686236263.pdfIn PDF document text
    • http://zonweringbelgie.be/ckfinder/userfiles/files/16522802002.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/49dfc7da34c596564acd9ecfeecd60e1/lizaxovowegijinaxaxujo.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/dukuzobebezudewe.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/e05af87c104d77f20834a85978be3b9d/54045379317.pdfIn PDF document text
    • https://irrisyst.eu/files/file/dimonoziripovosoxulovoj.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/wireragigunakosefapojeniw.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/xegakanariwuvutodadeli.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/67449870491.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/47867098952.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/51232956135.pdfIn PDF document text
    • http://springbook.no/files/dagagetajiw.pdfIn PDF document text
    • https://electroagro.es/pub/files/81842839951.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/n5tt01m4rte8dl8di81s0aocl6/31106164033.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/26710263558.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/gukuvunuz.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/84288966737.pdfIn PDF document text
    • http://bukharasuwanee.com/sites/default/files/file/woxav.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2ff992b30---tofuboximuwuwiparibigesu.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161291e3e0db17---48769266152.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__6117230A0AFDD.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/sunirenidazaxoponu.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/muvaxudesobot.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_off0000e18e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18E 17424 bytes
SHA-256: 21323cdbb2c2ab573483a9b9fef4515537fec0be58aade901b3461540fc1d2d4
font_01_sfnt_off00010e4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12666 11040 bytes
SHA-256: b7e5f1c4a6246faa275630319663c827ec5d652559d09279e7fa9401b09e1521

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