Malicious PDF — malware analysis report

Static analysis result for SHA-256 69770c976ded87ae…

MALICIOUS

PDF

80.3 KB Created: 2021-09-07 20:25:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f6257fd9a0ce5bf1a5de34c41aafe30f SHA-1: 6c81570a632fc86313ce5803740402f81baeea60 SHA-256: 69770c976ded87ae295267ae3df14cd320ff2af84189cf067067c34d64a4c597
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting it's used to distribute further malicious content or phish users. The presence of multiple external URIs and the nature of the heuristics strongly suggest this PDF is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/29c9d9d6tfst77s47sn02picnr/zoxadijukoz.pdf In PDF document text
    • http://alwaysfavorentertainment.com/clients/879371/File/gozigubenorafel.pdfIn PDF document text
    • http://18554080.com/userfiles/file/23240988510.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097909b754ca---22514314065.pdfIn PDF document text
    • https://mgc.to/sites/web/upload/files/rakazosixipuvabo.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/4b80d8c4bff370c67f24244c3a45b2d0/nufinosegudapur.pdfIn PDF document text
    • http://huiking.cn/uploads/file/021358188947.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/dukukusaruxaseriwug.pdfIn PDF document text
    • https://petek.biz/resimler/files/junulakosugikuxozasib.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161376029f4179---27429261841.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161377cc8e18b4---14636696165.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/19607240803.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/farudus.pdfIn PDF document text
    • http://clevio.biz/fckUpload/file/68411511151.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/xiloxidosubagajuxegu.pdfIn PDF document text
    • https://rugsdirect4u.com/uploadedfiles/file/60608262798.pdfIn PDF document text
    • http://thebellingerfamily.com/clients/0/05/05034faaa501c69409a7459485cba135/File/gojafarizegu.pdfIn PDF document text
    • http://wami.cc/data/files/lilejaxijuxub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=diet+after+bariatric+surgery+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB81 10880 bytes
SHA-256: 5a4c80bc09e5bd90d696d7bf55efd95405c19bdc255f315a66d21c53602e8918
font_01_sfnt_off0000d46e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD46E 18000 bytes
SHA-256: 79d93033e45d011b396347e8694218fb145a48cdfbdfcf23b07225419e4a0b7d
font_02_sfnt_off0000f03d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001084f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084F 17068 bytes
SHA-256: c15345f8a781835fd54634d69d217faf9d85b5ebee2ed106325dbbfcf7d429a6