Malicious PDF — malware analysis report

Static analysis result for SHA-256 791e075b5d577b50…

MALICIOUS

PDF

70.8 KB Created: 2021-09-17 22:57:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5b9ee26b7e93c660098b9f4a18d990d2 SHA-1: 303eacf04683944d4d9248ef4fb3427c92258dec SHA-256: 791e075b5d577b5071327dc4da832ba4d5ded6cbd2144da2a74be17cb555c86d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically highlights its nature as a link farm on disposable hosting, and the PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic indicates it leverages compromised CMS uploads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://crysiq.ru/uplcv?utm_term=best+wifi+hack+site PDF link annotation
    • http://boki.hu/editor_up/87296186744.pdfIn PDF document text
    • http://grimastone.ru/files/zovofemi.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/e18b0ab3b94e6bdd10b3e3332e303fb2/tawevafogepuzokuxiwunibak.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/4693ebb39fd7393a1cb47ad23045c420/86100061583.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/42d77b8b2ac77d5b0baa294c4f929261/sepigubabum.pdfIn PDF document text
    • https://bunianco.com/other_files/File/39286910483.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/49602081876.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/woratafawazuw.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/10229394088.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/fuposozonomavegesodusa.pdfIn PDF document text
    • http://hengfengpaper.com/filespath/files/20210908031915.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/jurobo.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/nagakem.pdfIn PDF document text
    • http://copy-office.it/userfiles/file/bavuxo.pdfIn PDF document text
    • https://institutdesante.org/userfiles/file/ranibomavavuxez.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/68437311616.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/rapuzeviwixanatupifijewub.pdfIn PDF document text
    • https://zemtechnika.lt/public/site/0files/gujoruzepomoziwax.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/389249214bd4595d77aa8a643666b164/puwulamojaduvukevajif.pdfIn PDF document text
    • https://strategie-forex.com/ckfinder/userfiles/files/9453396300.pdfIn PDF document text
    • https://avenue102.com/uploads/file/jimeda.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/97302040332.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/govonipilanip.pdfIn PDF document text
    • https://hsse.cl/files/redorasod.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce25c62b7c---jolexufefemil.pdfIn PDF document text
    • http://4bx.pl/public/file/manikoxekumisinegigi.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_off0000b91b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB91B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD132 10292 bytes
SHA-256: 9328e2720e93c95ee475ce156e3d7b0c5d6de38c07a59b78a21b109283fef2f7
font_02_sfnt_off0000e8a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A2 14684 bytes
SHA-256: 33a4328a6122a221cf5d908ca7f97f3085f07b054243c51871ab49d21962c1ad

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