Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c2dd815a545312a…

MALICIOUS

PDF

92.0 KB Created: 2021-09-17 00:08:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6ddf4acef0705e7d2c31373213399b44 SHA-1: b936654c33cdf1f3053d7ebcef407e6211c89cc2 SHA-256: 1c2dd815a545312a993d8f1f510c697957079fad45ccf61e739368a8295cc073
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several pointing to compromised WordPress upload storage and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. No scripts were extracted, but the structure and URL analysis point to a link farm used for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://giriconsultancy.com/content_files/files/944397020.pdf In PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161430b15afd0b---57625066593.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30222150732.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/nobilosobizenexut.pdfIn PDF document text
    • http://huynhgiabaohotel.com/uploads/FCK/file/zegavobubijagezemuwi.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/84808511992.pdfIn PDF document text
    • http://maihome.hu/admin1/file/gubonopojibo.pdfIn PDF document text
    • http://gr-chem.com/upload/files/kofudosatu.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/71016615460.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/damunulajexawerire.pdfIn PDF document text
    • http://eko-uklid.com/files/file/mosuguv.pdfIn PDF document text
    • http://superazs.ru/images/news/file/beligow.pdfIn PDF document text
    • https://malmospelmanslag.se/userfiles/file/jigovoxewipuso.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/buwevazologulusoxamifu.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/betelimiw.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210916042720_6g9unp.pdfIn PDF document text
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/figukawomonif.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce6eeb4c67---7813218449.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/dejeku.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9390259b6---xiwejinekedawewarigomomed.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/19140709344.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/kefaniroxige.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/f7f00a69f04bfe70e0d8ce726a74e2fd/pubijimusavowozuf.pdfIn PDF document text
    • http://themetamorphoseprogram.com/userfiles/file/90167578219.pdfIn PDF document text
    • http://hidropro.hu/upload/ruwefixem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+spoof+for+free+on+pokemon+goPDF 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_off0001022a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011a41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A41 10568 bytes
SHA-256: 96544cad5c4abc4c826dc6ce607d4ced1a8eef00b558c4ad524fbed0844e8ad7
font_02_sfnt_off0001326c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1326C 18344 bytes
SHA-256: 890e58841348dece724a988ba9c849f7101f3868530e805d8743d3a82fac35cf

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