Malicious PDF — malware analysis report

Static analysis result for SHA-256 a16454f82c72e64e…

MALICIOUS

PDF

83.2 KB Created: 2021-07-03 22:27:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: df0228e19e60a1739ba6e49f8b1233e1 SHA-1: 4c28ce0a98e5f5e0d2d741f45de028710b63abf7 SHA-256: a16454f82c72e64eeb0b7e40ca2b886baa212b3c145c4f975eb2f5601cda0fae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing to numerous URLs, several of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The sample's structure and URL distribution pattern suggest it's part of a campaign to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://nsck-cykelmotion.dk/ckfinder/userfiles/files/76137302979.pdf In PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16099f6270095b---86622269356.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/vonotawexarosemesobamak.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/xovemogefixajogaxekab.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/dinizosesegoz.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/776084da8c2aced27519b4806fa0c5ae/65931338705.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aadb66311f6---dufewezixunonanobis.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/newulefew.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ba37ef02e---vidixokip.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/regojamokow.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e47ef059b0---23853938980.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/midpcfjpg49mbejaqghm7ff3rc/rebozazujivesegazixav.pdfIn PDF document text
    • https://amblamy.ee/upload/file/fazeb.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/3jdhfed3gaslconrt09lcae1lu/raratasazo.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5a2862ed8---xeduj.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/nuluzefufewubekeziguv.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/s7l0v8npargcagvsp1dt4g02mi/42833807870.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/duvajajezodenejebozurum.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/35822373666.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d92c72a351d---tifevoso.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/xalawepaw.pdfIn PDF document text
    • https://alutat.com/data/file/zoxadamitiwolevap.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/78315717810.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/xejomugozekul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=hikes+in+nh+with+waterfallsPDF 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_off0000e32c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB43 10360 bytes
SHA-256: e6a3cde45596090d860f317e9b1e4d16c70c37c9374d9b21313acd646afda422
font_02_sfnt_off00011297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11297 16828 bytes
SHA-256: 694bb94b010da0d2c512f3d3bd87f51e30e3d865ca45fd20bd24e53781347708

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