Malicious PDF — malware analysis report

Static analysis result for SHA-256 d04348d5c9f86077…

MALICIOUS

PDF

81.0 KB Created: 2021-09-05 09:26:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: caf07536d890bd26628c718798d3a403 SHA-1: bff523318956dd498c98f04842a14f3c0836a523 SHA-256: d04348d5c9f86077fee73c5a0146ee2c8ebac64efb46fe4091ac9c9c9505983f
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to potentially compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links on disposable hosting and compromised CMS uploads suggests an attempt to obscure the true destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://chouchoudauphongongtay.com/upload/ck/files/dagamigejusodo.pdf In PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/l6vsl4fj13hi3qar9rbspgds87/fapukuxisapibuwumaturaxi.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/kabidapak.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/mijozujifejixazeju.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/fb4566cba54cecd5c71d0ac4fc89fa7f/telanigavegivejorupus.pdfIn PDF document text
    • https://granitnet.hu/editor_up/40301668408.pdfIn PDF document text
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/7395563208.pdfIn PDF document text
    • http://jdhs77.com/clients/58520/File/wisuvopi.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f521ada952---53021664621.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f53416e142---51254549609.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e6aecb613---84037611051.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/l0bodmna0eflprsvid2hj2oqq0/dowekopatevelowo.pdfIn PDF document text
    • http://gistys.com/userfiles/file/95484124341.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77371426262.pdfIn PDF document text
    • http://www.celso.org/download/tesosidit.pdfIn PDF document text
    • https://faprosid.com/file/nufodupupe.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/95149687269.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/xonirawomotofakizaxuken.pdfIn PDF document text
    • http://wongkungfu.ca/clients/f/f5/f5c316b966f29b3192b3e9e3c5714b3c/File/lovavuwukunasuzupo.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/meq7ur83memv3ip6l923dpm65s/95359514856.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/nubigum.pdfIn PDF document text
    • http://kbchina.de/upload/59299858073.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=printing+ink+market+pdfPDF 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_off0000d7dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DD 18052 bytes
SHA-256: 23053fdf498161da51af34c18f3cf47ce93218fd58b34a579fd07836ef3de309
font_01_sfnt_off0001070a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070A 10600 bytes
SHA-256: f78bbec33ab40cfedc7340b5723f9403e5c5aae594499736a1f22b560fa78838
font_02_sfnt_off00011eff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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