Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0ca6d599c006c54…

MALICIOUS

PDF

90.1 KB Created: 2021-08-06 07:19:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 609324f7e9a19303307b07beac21ae57 SHA-1: 19636f1d016841db06ebe0bc64a45fbafd22d3c3 SHA-256: d0ca6d599c006c5406385466efc26badc6865c582364291f76a40e1e893f9ab1
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external resources, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the idea that the document is a lure to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • 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 http://apexhealthnutrition.com/newerac2c/userfiles/file/dewasazeg.pdf In PDF document text
    • http://songpinhao.com/userfiles/files/50403403635.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bc99d248401---52201953398.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/xatexerotegiduwi.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/51583470863.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/xazetebevewapuwisifafov.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/31583631281.pdfIn PDF document text
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/bawofamujolegopebari.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/e1f9635b7ffab4faf8a02bdc6036500f/48108745416.pdfIn PDF document text
    • https://transport.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/fejetujaminevexakewowok.pdfIn PDF document text
    • https://mm-podium.ro/userfiles/file/wuzutivisiw.pdfIn PDF document text
    • https://istanajpdua.com/contents//files/letomaj.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/25082e20ca895f2895df8bed2618364c/jipofuketuwawagavapedoz.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/6987927591.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083374632d2f---30169125581.pdfIn PDF document text
    • http://webhenevents.com/clients/868374/File/wamisi.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/96349224239.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9e71abb67---muzutixelometatafir.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/0cdca3df3563a3f9b4d21f00f477439b/59549100497.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/74231dfdabe17caf2a25e14119e17198/4847691975.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/satofezodasusevisenumox.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/wasewoxogukataxepirozo.pdfIn PDF document text
    • http://esthebel.de/userfiles/file/jalupaxilivib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+prepare+for+driving+written+testPDF 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_off0000fb22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB22 10768 bytes
SHA-256: 1e842ece27c4bcdecbfcc59bb35e9f4cbe7abd0441558ab645097a2823bf394b
font_01_sfnt_off000113dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DC 17712 bytes
SHA-256: d3f363cc2eeb8c02055aa33f47dff0bb5d77cc9b32d7c2a82f16379605d5c6ae
font_02_sfnt_off0001421b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1421B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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