Malicious PDF — malware analysis report

Static analysis result for SHA-256 aef09f0600ba11d6…

MALICIOUS

PDF

73.3 KB Created: 2021-09-18 13:24:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 12bcb18e2dddae8b9bcedac536563f0e SHA-1: 3817934e171399fec8e9b879002bf7c870d8a4c7 SHA-256: aef09f0600ba11d64531ea778dabcf9d991fcb5da405e2e4d07767824aa98059
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript and multiple links, several of which point to potentially compromised domains or disposable hosting. The presence of a PDF_RANDOM_URL_LINK heuristic and the ML_NYX_PDF_MALICIOUS flag strongly suggest malicious intent. The embedded JavaScript likely facilitates the download or execution of a secondary payload, contributing to the overall phishing or malware distribution goal.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://arisutour.com/ckupload/files/12887825760.pdf In PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/41147534176.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/55369522783.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/59140949244.pdfIn PDF document text
    • http://balone.net/_upload/file///58463128186.pdfIn PDF document text
    • https://gangnampools.com/contents/files/70344021904.pdfIn PDF document text
    • http://lmnn.ru/userfiles/file/lijinidakalijur.pdfIn PDF document text
    • http://specimport.by/files/files/satawenav.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///favosuwagejogimak.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/11497951122.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/96235524917.pdfIn PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/rofigelogope.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/jekegagi.pdfIn PDF document text
    • https://birudongker.com/contents/files/44717414410.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/48095057117.pdfIn PDF document text
    • http://kite-surf.sk/files/xesazetivenudeduvufox.pdfIn PDF document text
    • https://sbmhavacilik.com/userfiles/file/watanezivevewonoraramite.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2d57db85f---73719089303.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140e38557a55---fubupusafawewamu.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210917_748BD087A6B00E12.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/i2kqtk96tm9nknqudq264selga/31151423169.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=pride+and+prejudice+book+pdf+in+englishPDF 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_off0000b9db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F2 11264 bytes
SHA-256: 837292276708ea7357f07a890f4fc802fc17be09af52837f05a0dd1fead72809
font_02_sfnt_off0000ebc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC2 16964 bytes
SHA-256: 7f4c0cd396f2faff0422a0b5ad8e01a4b24dafe32066aa4274acc2e4764a6663

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