Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f4e6a9c138f0f76…

MALICIOUS

PDF

73.3 KB Created: 2021-09-02 03:22:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f1f3f20da6b6d54920ca8771d20e7d48 SHA-1: fa186222de6b45239e6d7edd0877109c4cfc5168 SHA-256: 0f4e6a9c138f0f768edb8e6fe9fcc274c883e69bf3dd72634206c2492534188e
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs are the primary indicators of compromise, facilitating redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://inwebjor.ru/uplcv?utm_term=edification+in+the+bible PDF link annotation
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b6abe6f02---tolimutab.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/36960203351.pdfIn PDF document text
    • http://www.ujepites.hu/userfiles/files/javovewotujek.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/7ab71ec6b3b13b4239560d351edd53f0/kupizuraguzoxazipedu.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4a1db6328---roliwiterewido.pdfIn PDF document text
    • https://beruanglucu.com/contents//files/41623827214.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/90224434109.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/36122662204.pdfIn PDF document text
    • http://demkapi.com/resimler/files/kivogubavumubidofukar.pdfIn PDF document text
    • https://inprovitcentroamerica.com/ckfinder/userfiles/files/85529117090.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/1e7d4de0a86044e63f5220228fcd53c9/44883258568.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/govaridulosoxul.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/70942735355.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607216b927674---tabovesabogisinobakokafut.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/5599550650.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736e501233e---85470726868.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f550306686b9d747275bb3a016e826ce/74621910349.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/43429564150.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/27500282223.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/31477268774.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2b520cdf88---darakinori.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b148a688e6f---65835696382.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/47913721717.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/dcf948b26a43456df270557278079391/vutoluxokomomij.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746ab8dcfca---69820274577.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_off0000bf43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF43 15784 bytes
SHA-256: 7aaae350af70250943f5ee847ca410c6812c818087839114bcf9809de5c441ba
font_01_sfnt_off0000e7b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD0 10428 bytes
SHA-256: caacaa8d057e3a5bc0dc772d569885eebd547e4bcc96020ac2623dcf6ffc6dae

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