Malicious PDF — malware analysis report

Static analysis result for SHA-256 f11d726f261f90f1…

MALICIOUS

PDF

69.0 KB Created: 2021-09-27 16:29:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 83655b94bd2a82022cb03b4b653d0f4d SHA-1: 7825764731dcf0ad94f5ece77594a77616212d6c SHA-256: f11d726f261f90f1866de87f14998e4d525dc64f2688038caa0c6dc1d7189616
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://www.forteks.com.br/admin/ckeditor/ckfinder/userfiles/Images/posobukegomav.pdf In PDF document text
    • http://sinching.com/uploadpic/files/202109161905132256.pdfIn PDF document text
    • https://camelcarpet.org/d/files/kixedoferava.pdfIn PDF document text
    • http://atomiccm.com/userfiles/files/pojoratoxekiregurevo.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/piritag.pdfIn PDF document text
    • http://zagazzo.com/userfiles/file/riwuxuxuxenuratewefug.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b1cb05ad3f---12300215668.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/gafufevafovapu.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/jojozupudonaruligarasep.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1b4a432ec---49239379140.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d7096f38d---pojabevuzulam.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/86635812460.pdfIn PDF document text
    • http://tearose-kitchen.com/sites/default/files/images/imcefile/gibuduvura.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/98982208817.pdfIn PDF document text
    • https://maturana.cl/upload/file/mirujisivuvanolomipamow.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/korotodobigox.pdfIn PDF document text
    • http://ortopediaszombathely.hu/editor_up/90030922717.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161413ce918501---64170479885.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/98132481481.pdfIn PDF document text
    • https://qfse.co/images/uploaded_files/ckfinder/files/1631589579_ce265fe047.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/sunolijuzexegejofijosovik.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/10650443470.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/zifazipilipovixegimimakus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+change+the+name+of+your+android+phonePDF 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_off0000ae8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE8A 15100 bytes
SHA-256: a4d4edd9131f3688887599bfff74b6a26661d5583ebea03844e85932d28ee142
font_01_sfnt_off0000d458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD458 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6F 11144 bytes
SHA-256: 7a1ee7de2990def2f10f27d25aca9f8b3f320511965d208446ee98c8bdf66ff7

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