Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6a43a6aae551f45…

MALICIOUS

PDF

81.8 KB Created: 2021-09-04 07:10:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2b7fd801fd7711aa8000f25858b4b98c SHA-1: f9f25e0e01dec8afab3bc12ad151046e5052f17b SHA-256: b6a43a6aae551f450f4321c6143717c3c1d46843138bfa22bb71211d3954bebb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a tactic to distribute malicious content or redirect users to phishing pages. The presence of these links indicates an attempt to lure users into clicking through to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f693e8f12c---gelajukoxibewinisusa.pdf In PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/kedomajemepukev.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/c559a78e4890efe1346bda6c722e5745/12504094717.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/43368540663.pdfIn PDF document text
    • http://artediapharma.com/upload/files/58180843860.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/vujug.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a99230ade7---tikojexexiluxekunakijof.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/10303145400.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/53922551075.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/bijajobadapas.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/navekivijogobavawufawo.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/34841768981.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160877199cbc5c---mizepunudusetematevirowig.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/9c1c706a9966fd6fa7a65e8885b51d4a/bovusosusigunemubowewo.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/45310108472.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/15377186941.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607502d03b0f8---kakenuzilimenupe.pdfIn PDF document text
    • http://somersetcountybar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dujimexo.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/jubunuxuvedupabilo.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3cd7c87474---bigiwesolozurowawag.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/33653321394.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/wowalamif.pdfIn PDF document text
    • http://pmteventures.com/clients/5/57/576e8e71b788aac95a268099fab76a3d/File/65970913126.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=%D0%BF%D1%80%D0%BE%D0%B3%D1%80%D0%B0%D0%BC%D0%BC%D0%B0+%D0%B4%D0%BB%D1%8F+%D1%87%D1%82%D0%B5%D0%BD%D0%B8%D1%8F+pdf+%D0%BD%D0%B0+%D0%B0%D0%BD%D0%B4%D1%80%D0%BE%D0%B8%D0%B4+%D1%81%D0%BA%D0%B0%D1%87%D0%B0%D1%82%D1%8C+%D0%B1%D0%B5%D1%81%D0%BF%D0%BB%D0%B0%D1%82%D0%BD%D0%BEPDF 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_off0000b712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB712 11392 bytes
SHA-256: 34138874dab5a1ead2958d3a9002683af619fc019a849e5a0ee508e2b73fadf2
font_01_sfnt_off0000d145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD145 16244 bytes
SHA-256: fddcbe21bdf9fb2753729b4ab5b26d7a3fbb01e3fe51d41ab0725360e25c189d
font_02_sfnt_off0000e72f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72F 21976 bytes
SHA-256: 9af56722888a60c21e7fc3f782b8f41ede2fe452696ec1ee16cca2c151c6a33f
font_03_sfnt_off00011d38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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