Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d50a440d9214222…

MALICIOUS

PDF

73.2 KB Created: 2021-09-19 10:05:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: aece53e9bd69c406dca3483d9246478c SHA-1: 3ab2ac2f9a2b375c7c96d158ff6613ade28b4a7d SHA-256: 0d50a440d9214222e986a2555ed416033911029fe42a9fdabad1900445081ca0
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads or disposable domains. The presence of numerous external links, including one with a 'utm_term' parameter suggesting tracking, points towards a phishing or malware distribution campaign.

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://nomylo.ru/uplcv?utm_term=bajirao+mastani+full+movie+download+720p PDF link annotation
    • https://dortmundpools.com/contents/files/kikanawu.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/xogasa.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210913_094437.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/32506304702.pdfIn PDF document text
    • https://htcpost.vn/vietpost.vn/img_content/file/desolidorum.pdfIn PDF document text
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/30870256583.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/161416a45d1422---kidobovoxeriwunofivi.pdfIn PDF document text
    • https://sicurezzaips.it/uploads/file/ponukenagusutepipiget.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/29393046710.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/39253740326.pdfIn PDF document text
    • https://amgaa.org/temp/files/55542233403.pdfIn PDF document text
    • https://valleyrentals.com/userfiles/file/30278041183.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/80305700261.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/zojosagojidikij.pdfIn PDF document text
    • http://svb-volleyball.de/userfiles/file/vitowux.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ccf985ba3c---61285456419.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/wakuvewenuwuvixejojum.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/ofnjkmi80m9soh2hqnu27mkifg/20015355974.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/8qc59ermp3ql6l31iqt25rhcfp/tamojuvatu.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/50548453997.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/puxezokoguzegipa.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/bomowutinadupemi.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/64933935356.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/17968168430.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_off0000b884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB884 16764 bytes
SHA-256: 3c2853fbde1feb098e87bbbb63d6aeeef5756b533f8524284e85d97cb1a2e320
font_01_sfnt_off0000e418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE418 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2F 11384 bytes
SHA-256: 638c6b49808a4fecb685af01e00052e90b65d779de7cfb8b165575b862038415

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