Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f67c22cfc0d3b51…

MALICIOUS

PDF

80.9 KB Created: 2021-09-02 13:36:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0f767637ba09d88391151cc89a0d3d18 SHA-1: 1d50dba009365f83ecc3bcadf54ae8827b892f42 SHA-256: 5f67c22cfc0d3b51a84a6afeaef38b4e8338513283e2dc58d3f059c5b86f61c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, indicating an attempt to hide its true purpose, which is likely to facilitate phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://oniceh.ru/uplcv?utm_term=nrega+scheme+pdf PDF link annotation
    • http://france-ex.com/images/blog//file/sonin.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/8db2bbdec71611e06e10e302a0a0abb2/zexoneg.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/rufejuv.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d65b9a0d28---sovovisotemanojiwel.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b726ab2bcfa---rupafanobifok.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160847d0076b7a---48255107425.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e15da4384---zikav.pdfIn PDF document text
    • http://sapaelitehotel.com/webroot/img/files/pagujokerobedi.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/bixopelozopadir.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/wukelutuduxugaponuvise.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202108140415301462.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8c038e776---fudexajamajedosopozalodiz.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/70b3b131f9c45a1a8ad89ca91a78d387/tikunilewo.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/warubemavigesojokujitadip.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/zagevomefurinepatad.pdfIn PDF document text
    • http://purepoem.com/resource/docContentImg/file/2021-07-22/0bf870fb3d45ce7e99d965c67a4ec9a5.pdfIn PDF document text
    • http://yanartekstil.com/firma/files/33269708338.pdfIn PDF document text
    • http://decorstore.eu/upload/file/91604296882.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/4glvt8giqsu74i6m7cpnu6bkrk/6013050040.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/duperatanewimotizobu.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/f7oi7md2slr4ej1eauh7qn8u6i/99671753651.pdfIn PDF document text
    • http://husplaza.hu/editor_up/39786858788.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3b89edc5e---zasanabejadurafegivixo.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/gifuzun.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_off0000db18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB18 10584 bytes
SHA-256: d2557d5b74baad3dfbdaf1b9a1dad8ffce40066668b4cab99e2f0218c1ca5ec7
font_01_sfnt_off0000f302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF302 16636 bytes
SHA-256: effbc37794bb2c3d39075414968192f78bfd892c2129cd8359b044d2620af030
font_02_sfnt_off00011e02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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