Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8d90dbca9838752…

MALICIOUS

PDF

65.9 KB Created: 2021-09-26 01:37:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b52863ca68cb69abe88277392ebd7b51 SHA-1: 78e37fc317539546deac4b81b1590be35a238250 SHA-256: d8d90dbca9838752c5b281cb9f256ff53c87ca62432738355c63862bdff9ff90
184 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains embedded JavaScript and a link farm pointing to various external URLs, some hosted on compromised CMS uploads. The document's structure suggests it's an image-only lure designed to trick users into clicking a link, likely to download a second-stage payload or redirect to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 65 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.hebrewforreadingcomprehension.com/content/dokete.pdf In PDF document text
    • http://keacg.com/upload/files/kumewimonesovatezowofi.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/26052718821.pdfIn PDF document text
    • https://parlagame.net/calisma2/files/uploads/9246437069.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/nasik.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/88828768528.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/75565077936.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/098b5ae7276f5b06bb0bf52c4513d006/pezomaminesenusajosevoda.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613146bd2f789---54821510145.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b00694215c---81185298154.pdfIn PDF document text
    • http://artiguardia.pl/userfiles/file/15321246201.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/satidilokulur.pdfIn PDF document text
    • http://video-cycling.de/files/file/84422411381.pdfIn PDF document text
    • http://hijoin.hu/editor_up/pewulajufepemebopu.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/50604169253.pdfIn PDF document text
    • http://abwva.com/uploads/files/50433399814.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/42319235612.pdfIn PDF document text
    • https://futurefacesnyc.com/uploads/file/fulubuxe.pdfIn PDF document text
    • http://techniq.ae/admin/uploadfiles/file/85012471286.pdfIn PDF document text
    • https://armenia4d.com/contents/files/mukagus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=api+android+adalahPDF 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_off0000a974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA974 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c18b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC18B 10072 bytes
SHA-256: 3da509b335ed124a346fc01a60afb82a8f07d76b6d5a9e2bc529b1b2aa60cdf3
font_02_sfnt_off0000d7ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BA 14148 bytes
SHA-256: 7f392f0a504e5ffb2c9931cfe34a892e1f7e1f331e50caf36017ffa2a333a793

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