Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca4ac7f44e37493a…

MALICIOUS

PDF

82.1 KB Created: 2021-09-22 17:58:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 68a01a2f46a7797039f9146588e82637 SHA-1: 822e0f2a956374c3da7f9d0bbe2484239a2c6be6 SHA-256: ca4ac7f44e37493af88135296f39bc29b54546e1f1c4041a3c907a9116702b8e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crewmak.ru/uplcv?utm_term=kotlin+biometric+authentication PDF link annotation
    • http://er-trans.com/img/produkty/files/golozokit.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/gatafukesuxiwigozax.pdfIn PDF document text
    • https://topupdana.com/contents/files/20188475179.pdfIn PDF document text
    • http://ablerexthailand.com/userfiles/files/73953317326.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/161487a24a2203---bowikirabomonasamopup.pdfIn PDF document text
    • http://calisnt.com/uploads/files/jamodoxofavedivatukewij.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/88351816932.pdfIn PDF document text
    • http://giteduguedesboires.fr/userfiles/file/44786375353.pdfIn PDF document text
    • http://velomagazin.hu/UserFiles/file/jeresu.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210916125141.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5c1f33803---fezifofo.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/feruxoxidolaxilogeve.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210912071946.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/bebojawunoremub.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/98761556024.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/qgdqk5lagdt94srtb0g9nstviq/17644277316.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffa99dbad1---4996583612.pdfIn PDF document text
    • https://sausalito.com/wysiwygfiles/file/95935041781.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/zobusepudiwed.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/86095832151.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/22403642927.pdfIn PDF document text
    • http://marikitaberbagi.com/userfiles/file/pagowum.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/61119277291.pdfIn PDF document text
    • http://lonniestireandauto.com/nbloom/fckuploads/file/gagifusivubaxurajavimo.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/wusokamavoxigev.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_off0000dc38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC38 10560 bytes
SHA-256: a2348bf9f083cb4dea20d94b27215f384a8a4c916507654c7a5268df4a781b12
font_01_sfnt_off0000f40a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40A 17900 bytes
SHA-256: 539e869c65ad3ce20437d0408f56e9b20463703e5422a4d65ab5f5d960336a32
font_02_sfnt_off000122ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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