Malicious PDF — malware analysis report

Static analysis result for SHA-256 10cd5d2a372bce90…

MALICIOUS

PDF

81.7 KB Created: 2021-07-05 18:00:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: c106ee9ea6e70b6066fa2b417f2ba91c SHA-1: f857dcd52423d977901d484f0b73f21c95e1f4be SHA-256: 10cd5d2a372bce90047d15f23acfee584b74dcdbd0cad845a31d739cb4635be5
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

Heuristics 5

  • 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://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a58ebe9849f---28265884728.pdf In PDF document text
    • https://businessservicesuk.com/userfiles/file/masujitabelo.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/24024367677.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/1937818428.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7250d7322e---fitorobuxikel.pdfIn PDF document text
    • https://ev-owners.jp/userfiles//files/totanosuwijafof.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/lefogijututidemuzemope.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/c50fef32df54fe0bbf951e5f21646767/fekel.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85224364b8---zilifazaxopopo.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/d1bba87f5816ef49498d162200c5212f/mitadizurupagafi.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d957ecca5a3---30225206000.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///37185943349.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/99bb608e64846a6014c7996827e7efbd/vusilijov.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e6e71fdcf---vizugekid.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/faf23bdab386d0734a2a7eca9ffba4d1/zibilewipejudiz.pdfIn PDF document text
    • https://lecapsuledigian.it/file/92358443236.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/39800284479.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/63unb89a4cdufrhnuu918rnj97/16675726490.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/6e32db6648bb3a0c8104d72fa406711e/30738852846.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/61321091714.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/kizebuxewexexipu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609180cf7f70a---semunonesiborasip.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/18033399335.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=angry+bunny+from+secret+life+of+petsPDF 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_off0000c3fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3FE 16224 bytes
SHA-256: dc06733fb1b3e8baa4303a7b234726769048d67753183ec25fed266cd0fe6b8d
font_01_sfnt_off0000d9c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C3 16988 bytes
SHA-256: aaa2e2381a895d77ac9345915335de1cb2f8e98a05fd8011aea28cde578c4303
font_02_sfnt_off000105e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E4 10996 bytes
SHA-256: 9c1c8a6cb01133bceca088c00956bd839d5b7047d7c8be873c747ce834ec17bb
font_03_sfnt_off00011f4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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