Malicious PDF — malware analysis report

Static analysis result for SHA-256 d69933db8e4db0c4…

MALICIOUS

PDF

78.1 KB Created: 2021-09-03 21:10:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ac954832a577fcda66fec8dffbcb85b8 SHA-1: 8ffc041ca754dfc5a1ac3b7b3ec6a3ff82e17940 SHA-256: d69933db8e4db0c4b6c9c4c59c13345c18546ef11a529681171b7af524ee03c9
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely intended to lure users into downloading further malicious content or visiting phishing pages. The presence of multiple links on disposable or compromised hosting suggests a deliberate effort to distribute malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/fvgfkaf8asonud3ln7bldn4176/80352423862.pdf In PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/fovopugim.pdfIn PDF document text
    • http://europavloeren.nl/siteimages/file/momagufupitel.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/6d2b2a7cb2d3304eadf0f5a8a78b1254/bijukedadukamubaweworep.pdfIn PDF document text
    • http://melhi68.com/clients/69549/File/62162585302.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/rifipul.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/fibadan.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608faa9097762---43645868906.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/aab214164ae6ced3b95d93ba041623e2/notuburupojakuxafixoj.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/18292247971.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/29rdbul2v8lvdo0kdghrv5oce4/minameselib.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160b81bf28889a---31919736362.pdfIn PDF document text
    • https://eguiders.com/uploads/92789439294.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102fe0d78710.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/43537321954.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/80383159975.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/a52fa41fe6393dac9a269f4a49beef5a/guragexorene.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/4abe6d9da5b724b1801021d823b621fa/80464230801.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/bulesivijijijo.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/pevemakoniwi.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/fadefilerizubojefon.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d1f87cccf---93848663059.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/gosojalumabalabogef.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a78fe94e603---xusora.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=sonata+undine+reinecke+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C0 10668 bytes
SHA-256: c7ba1ac6492026bc047205c0eb1cd1c4b3ca7b9b722a5c7958e08ee0577233a8
font_02_sfnt_off0000fa59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA59 18516 bytes
SHA-256: 7e451ab54170c03b918d556f755f92c2e47f3e8a1837cea3e1c25e446db5794a

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