Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9bf42f0e0f05e7c…

MALICIOUS

PDF

81.6 KB Created: 2021-09-17 19:25:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 82f62a1c52c29dd5a1558cf4efc85f01 SHA-1: efa31f6226269b2cf1f2508b7c062e214819425d SHA-256: d9bf42f0e0f05e7ccb6ee7e98094e68829709bbd830067e0151f8b59f0e2f6c6
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some of which are hosted on potentially compromised or disposable domains. The presence of numerous links, including those pointing to WordPress upload directories, suggests an attempt to distribute malicious content or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

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://kxqcgs.net/filespath/files/20210909091454.pdf In PDF document text
    • http://wamaeassociates.com/images/uploads/originals/file/52054681499.pdfIn PDF document text
    • http://onestep-tokyo.com/userfiles/file/65015774661.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/zalejipidi.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/jemajofuzux.pdfIn PDF document text
    • http://araonline.hu/uploads/file/tusawofazesibodakijurofe.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613cce2ddbb49---duviniguvupomolumizikolud.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/b5161c1ea5bb7d4ca9e9e37b8d480038/83310951046.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/46307589923.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/161301a6e96ea7---mikuwujawozonamexotopur.pdfIn PDF document text
    • http://topflexsports.com/uploads/4593980317.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4bfae1da8---54995619879.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/47478182350.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/5458085644.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/nububoton.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a875d32d93---xebarobe.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/vesovepowo.pdfIn PDF document text
    • http://keemunblacktea.cn/uploads/file/051604405151.pdfIn PDF document text
    • https://artedelvalle.cl/gal/files/file/fejoxiguwetijemebeguzarix.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/pezijebukojaravubijepo.pdfIn PDF document text
    • http://strap.sk/uploads/files/21389164456.pdfIn PDF document text
    • http://travel-door.com/userfiles/file/vumufidegoxabuvij.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/71411132391.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143d71c9a0b4---nejovefot.pdfIn PDF document text
    • http://runhouchem.com/upload/files/68577674695.pdfIn PDF document text
    • https://kubermatkaplay.com/ckfinder/userfiles/files/54773076749.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=unifi+l2tp+androidPDF 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
stream_005_off000106a0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x106A0 16872 bytes
SHA-256: be585e2dbb0af998c921190be8f2d249af0b8f60b0881c6c2d1e6fd99ac4ac52
font_00_sfnt_off0000bc2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC2C 10320 bytes
SHA-256: eaea25a3ca8539a3a1730f135b9f7984e21eb6da2f2a3f009f3b72c0cbd5ce34
font_01_sfnt_off0000d383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD383 20772 bytes
SHA-256: 44815e084f4227fa6f2c409ac878c08521aef15f41a5eca0c52a68b03cf3ac39
font_03_sfnt_off00011eae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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