Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7016a81c07f183a…

MALICIOUS

PDF

72.0 KB Created: 2021-09-19 10:17:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e857b30d805481c7585513c330fb9c58 SHA-1: f775a8cd0c55a09a3d1f3cbfbb8c8a7eca451d02 SHA-256: d7016a81c07f183ad49f87e576a43a791cd6bb700d985d51576776900f9f5e66
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely serve to redirect users to phishing pages or download further malware, aligning with a common attack pattern for malicious PDFs.

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://crysiq.ru/uplcv?utm_term=nora+roberts+books+free+download PDF link annotation
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/161449ec253565---jiwivajadifujijuzavag.pdfIn PDF document text
    • https://bela.geekers.tw/upload/file_folder/file/bupozadafuxafogivugixeb.pdfIn PDF document text
    • https://bawauang.com/contents/files/21832021990.pdfIn PDF document text
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/82404212328.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/423758147.pdfIn PDF document text
    • http://severstroysnab.ru/userfiles/file/74181677084.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/bigapizepijinife.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/b8fee5196bff1a15609515a2a00efd82/41912088774.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/94466993273.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16130d05791d25---6643653658.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/telimerewarevol.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/geboxufasafajiduzeririso.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109060922316183.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/hoq32e8a68ikqrp9pjs7p976qm/pubulenufigavus.pdfIn PDF document text
    • http://hotechike.com/files/files/65100750753.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/59960198613.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f24b2156c6---kirolasovaw.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5b99c6fb0---69474850882.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/vumitepivelupunoxulinap.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/fewajolarurifezo.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/73918517894.pdfIn PDF document text
    • https://dubaimotorcycletours.dubaimotorhomerentals.com/uploaded_images/files/fezakepuxaxugusek.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145bbd5b99b6---mugoges.pdfIn PDF document text
    • http://stefani.cz/fck/file/5862612719.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_off0000b8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0CC 16196 bytes
SHA-256: 945b6daf352ed05b6cedb35f0f9d7a6f17d5a0ae346c3010cd5a9e18626ecbcb
font_02_sfnt_off0000fa4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4E 10552 bytes
SHA-256: c53aac86b62743dcf4f366265576881b6bfc065ab8e7236fccafee1cb2807992

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