Malicious PDF — malware analysis report

Static analysis result for SHA-256 f43027f70e6b8e12…

MALICIOUS

PDF

78.4 KB Created: 2021-08-13 19:53:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1866a71fe6a895d769c01b9a2c076b8f SHA-1: c2053e036e9ed2e20cb893b6a1ef3ea5d8a168ec SHA-256: f43027f70e6b8e1214886571d999d5e97c9b57d18e732018a4f8695574313594
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious documents that leverage embedded JavaScript for redirection or exploit execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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 https://crysiq.ru/uplcv?utm_term=auto+clicker+apk+apple PDF link annotation
    • https://edu-mate.kr/_UploadFile/Images/file/96300786890.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/kodutopesefawevuxetemas.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/17299475152.pdfIn PDF document text
    • http://suapaiatuipelehakefamily.com/clients/80707/File/89160647101.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/75720826750.pdfIn PDF document text
    • http://www.polni.si/Images/files/giral.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/figeg.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/ruvemedilusiwix.pdfIn PDF document text
    • http://morpheus-architects.com/file_media/file_image/file/20909942437.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/355cf2d74dbaae267463be1b5487f611/67623457120.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/2cbc71122834b3911c5427ff1bf6ffb0/48069266809.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a286cbcbd59---30817756382.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/32932564933.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2baedec7bc---manojetovubovagojurelaror.pdfIn PDF document text
    • https://tonitomov.com/picture/file/saziz.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/65730107180.pdfIn PDF document text
    • https://bursac.net/userfiles/file/bomelevuvukasafinafi.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/93601085903.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/f972cb61e1585f284ca736e3c58d6eaa/wikapetuj.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/hgupj75e4q9ht2pcq5lteu5btq/fumulelogijolenikuzu.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/73049605743.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9954f93510---jukobufonatotifusesudanu.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e564dafbb---68967014557.pdfIn PDF document text
    • http://ekotronic.eu/files/file/momuxi.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/70395514431.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/77346616313.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_off0000d0fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0FC 10268 bytes
SHA-256: 6e766cfca300b9b7dce57a034b2c1be1d69eb7da4bb12eb27b5a77b35cda7f85
font_01_sfnt_off0000e83e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83E 16428 bytes
SHA-256: 50bb1094d0bbceda27628b9408abcdb57e5f0c68a184d101ddbaac794dfb98c7
font_02_sfnt_off000112ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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