Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f0c3666056a3b8c…

MALICIOUS

PDF

81.2 KB Created: 2021-06-19 22:05:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 624f7f49ba7127b1ddbdebd615dad8f0 SHA-1: 60fc9bcc9d1211bb668df0d8a2a36819f2672f8d SHA-256: 4f0c3666056a3b8c28d30597b5e8e1dfb8628a4432141e1da820f29dee4cf044
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains multiple links to compromised websites and disposable hosting, strongly suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support its malicious nature. The document's content, though heavily obfuscated, appears to be a lure for downloading a file, likely a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://topinsolventa.ro/userfiles/file/45833984737.pdf In PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d99b674c2c---turapuboledad.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/ns6d0nctl0l35ueo2l31bdg2c4/54513305888.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160716c9a8a089---sugiti.pdfIn PDF document text
    • http://nappsa.org/userfiles/file/banedirelabadazi.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7240a61b9---giwib.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/6e7g94e7tjlgfqf5v55a4rqqu2/gulonubuzukalak.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/69366128184.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/b6vh9fm9k01hp38ku6305ekt34/24399062318.pdfIn PDF document text
    • http://cherishedmomentphotos.com/clients/8/84/84fe84b553acfcd191e166b7401b6f02/File/mixonejufijavatibu.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c194b2319cf---97612190201.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/co1cdb37htf37nlnkdb0p1ovs4/81593892070.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/bf0bed29b054593e72e330bfdb7a2aad/81470470829.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/sunefenodowevufipiloronoz.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/aiv8675kd3ogeb09kmar758tpd/89511978897.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160969a15493d7---59472447027.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef9fec5f40---puzefaxekadonapulobu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=fresher+resume+format+downloadPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE470 5028 bytes
SHA-256: f2513cbf8069bd466d0961554daf4b753391ff2ffdd1c8209b5a7b00cce7aafb
font_01_sfnt_off0000f571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF571 17348 bytes
SHA-256: 2da644f5cfc37c7ab168f671f5e825919b8e0f75a5fd1073720a485234a6141b
font_02_sfnt_off00012995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12995 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2