Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e546387c953a423…

MALICIOUS

PDF

73.0 KB Created: 2021-09-18 02:49:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 25e8f799a96ce9f755001faa517d7bf5 SHA-1: 444f4e2026b218065a7c877463c9c7e140dab198 SHA-256: 9e546387c953a423b7eedf0977d65d058a031400f711849e10501505896c734a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing or malware download sites. The embedded JavaScript may be used to further obfuscate the redirection or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • 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 https://krisoc.ru/uplcv?utm_term=what+is+the+importance+of+amazon+rainforest PDF link annotation
    • https://akvanova.ru/sites/default/files/70680560816.pdfIn PDF document text
    • http://itexpertdog.nwoasis.com/upload/files/14932859193.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/degajozikafanegefigilujok.pdfIn PDF document text
    • http://www.77ice.com/upload/files/82380045710.pdfIn PDF document text
    • https://asiapharma.la/files/files/moramumijivadiragojosagi.pdfIn PDF document text
    • http://www.petersonassoc.com/emailimages/file/lixusajalaz.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8bef4e08f---67778681654.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/94d561939076f4af6d27fcb83bfab769/99424608639.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/jetapibu.pdfIn PDF document text
    • https://swiz.eu/files/editor/kipuwasanu.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132df3a145b2---39989304977.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/wanisa.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/worewenol.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/96205094227.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/93173520985.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/56263442934.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/6645713603.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/runuwaxetizopijaxoz.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/13211828618.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/c2b3f4e595cd77dd9baae6c9ecc402ea/66922118551.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/83786469759.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/nunuvoxatutif.pdfIn PDF document text
    • http://geose.ru/userfiles/file/76401489889.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/bf7e35e5832bf5d9924b8f178d522f63/pomenurinof.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_off0000bafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD314 10752 bytes
SHA-256: 66dd3210d3846d27063ac1272f17c0a79f34b8ca6f0c4d543e7d884e85aa8c78
font_02_sfnt_off0000ebb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB5 16476 bytes
SHA-256: a3c18fc72fc4077517a0568dabcfe06a870b529f95e4f331b4f83dec0a4d5073

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