Malicious PDF — malware analysis report

Static analysis result for SHA-256 122772733986782f…

MALICIOUS

PDF

84.2 KB Created: 2021-09-09 17:03:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 196e6ecfa16828cf263a5b6e1cc56e75 SHA-1: dab22c01466af4331fd492d3d814d402f0599588 SHA-256: 122772733986782fb9e6cb2fdec0416847e5db8c91c18920946b113e5a6be75c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting or compromised CMS upload directories, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farm heuristics supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=good+backup+app+for+android PDF link annotation
    • http://xhiehchin.com/Xhieh_News/_file/kobirazezowozi.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/83293240809.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/27018528637.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/detogotejejamunapebomuva.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/1708173284.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16136ebb00d7b8---digelodedowogowodaja.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/92756825958.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/dasikunepadu.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/75396500503.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/ragijisowoseta.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/6839041afe8c4b56aac2750c343a3bd9/14291064483.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/84019818237.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wegodufobufik.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/49948980619.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/91305018770.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/23532376398.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/931022605a39d993077e5ea82bee509e/lokamerebudidupidizure.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/19567803493.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161306d95c7d5b---37798298848.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/70166307895.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/moxiduvigowa.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/27400886179.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/bujen.pdfIn PDF document text
    • https://sona3elkhair.com/userfiles/file/21054250950.pdfIn PDF document text
    • http://getdol.com/page_data/file/35308064032.pdfIn PDF document text
    • http://vet-spb.com/userfiles/file/zepilaregora.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_off0000e64d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64D 10540 bytes
SHA-256: 027d097b5bfbf0ecb9c5ab750bb9617734b79568842a8ad86bc0f40220af44de
font_01_sfnt_off0000fe2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11641 17228 bytes
SHA-256: 87cfcc57c9175167944dc77346b1473919500e3e9ddbf89214921450b2cb45f1

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