Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfda0e555fcb2b79…

MALICIOUS

PDF

88.0 KB Created: 2021-07-24 10:09:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e3c9d3be9b0bfb5f6bcaf8dbdd4fab34 SHA-1: 359281de91c55aa91db5060a5b50782375d44949 SHA-256: dfda0e555fcb2b790e1b471e9b9bc0496d5b1b569319fd72a400485b95ed1c31
204 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document instructs users to copy/paste content into a shell, suggesting an attempt to execute commands. The presence of numerous links to potentially compromised WordPress sites and disposable hosting further supports a malicious intent, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://juhaszautovill.hu/userfiles/file/sedavupupen.pdf In PDF document text
    • http://donghocasiochinhhang.net/uploads/userfiles/file/nosate.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/aoilamgtaoi44ggj351jm2nicu/91722319258.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/lfl501h1r5skj0ohqlsqfjvk6c/zedivodelojevobunufefozef.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/xemijelumodisov.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/41324f31a7f2e4162c1d98b064406972/4193956279.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/a82474df5d71aceb3300e003b16613f5/7736840825.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/30738022797.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/738bdae8a8cb14b1f00f2325aee2af60/77894583997.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b39c434159f---48179402593.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/zexomokevoganafewumon.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/69412125169310cb9f4aa6e7a4834219/79374185477.pdfIn PDF document text
    • http://ozona.pt/wysiwygfiles/file/majazopiwaretelot.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/78550421321.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/mifezexozalegiz.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/c68ef645f2796b6c7b85ddb405a2e5a1/wovadolokikabifekowupe.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b2e9b2bffe6338466f0f580c4cf2b2d8/piwasi.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/dutawe.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/3359scitpip5qebdtm4a5sa2mh/tozilulisop.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/cf6de85c9d8085d5e2c50d34730bc131/xokawofogot.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///51021697025.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/punatuzuzo.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/464b661f30d57f9f91d850775ddaca33/24586420784.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/78vjrv41df4j1d3m56lg74uce2/nigapemamudipokedafuzixa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=anime+character+creator+full+body+onlinePDF 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_off0000f26c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26C 17504 bytes
SHA-256: 444e09d7739d1710af4f6ad194f0024b022b705b6c658e11019b9891941142f0
font_01_sfnt_off00012069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12069 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13880 10908 bytes
SHA-256: 20e72af7260b7ccb4a34e243c3922eb82724c0e93365ea50888ae8c00e9ef1ae

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