Malicious PDF — malware analysis report

Static analysis result for SHA-256 4240fa006b024dbc…

MALICIOUS

PDF

83.1 KB Created: 2021-09-14 10:02:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0a81979e1449e4966a0910ed25a6033a SHA-1: 911307f250628743ffabd96437f4b8f6e9a2c62d SHA-256: 4240fa006b024dbce66c9e7aaf12c3acf98ba7afec63b7698061bd011adfed3b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content. The presence of 'cmd.com/data/files/puvilebaxurezoporuz.pdf' in the document text indicates an attempt to execute commands, likely to download and run further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/4757d53348f8dff2265ed650c456240c/tajotazexaxirilovakulik.pdf In PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/88069036250.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/2t459rpjs1so2alskngvgp092s/68878754706.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202109010037176509.pdfIn PDF document text
    • https://cnc-ar.ro/files/file/kutunobaxotelurojukigog.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613db4c6ea96e---65532414675.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/06b5p14kbdd0g0lm08637sa1h4/43547656374.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/faloz.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/eec1a850bf92dbdca6d1e6ef8359d228/37949191238.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/8538141639.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/83532000306.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/ketebarixutekegus.pdfIn PDF document text
    • http://qdcmd.com/data/files/puvilebaxurezoporuz.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/raputumakenixugimi.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/963d97a166c273a8c4f8451b3f2f285c/40388306166.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/pedonirilowivajaleri.pdfIn PDF document text
    • http://laduses.nl/image/file/karevodopafawumoze.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/nezugebitufi.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/siseji.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613df25c554ea---27603019512.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/35520439894.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/44035875313.pdfIn PDF document text
    • https://www.bevillelecomte.ovh/ckfinder/userfiles/files/xifinodajuluwevexo.pdfIn PDF document text
    • https://muzpony.de/obrazki/file/51811649735.pdfIn PDF document text
    • http://liweisteel.co.th/ckfinder/userfiles/files/17156058567.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/sobanowezag.pdfIn PDF document text
    • http://northmarkiIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=mathematical+statistics+with+applications+by+wackerly+mendenhall+and+scheaffer+7th+edition+pdfPDF link annotation
    • 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_off0000db29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF340 11360 bytes
SHA-256: fe54d0f7a99b96ff9a2d424bf52cc00d2387ebdcec60ea27932d47e0aa1df480
font_02_sfnt_off00010db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB4 18052 bytes
SHA-256: 4d16cd57c0515fe98a553a59718d2685184da65d42973fbdda76b7a54ec72e47

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