Malicious PDF — malware analysis report

Static analysis result for SHA-256 c65d47ba17d68d10…

MALICIOUS

PDF

89.7 KB Created: 2021-06-28 00:04:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4f4328945d029b2aff79f882c56f0ba7 SHA-1: f5ecd706415720f20fcb2f3b4de6993a26a499e7 SHA-256: c65d47ba17d68d10ce0eba0830066b7c31043526bd6f5c96d4352a0cec76ea53
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution via these links. The document body is heavily obfuscated and unreadable, suggesting it's not intended for direct user interaction but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://cructi.ru/uplcv?utm_term=witcher+all+gwent+cards PDF link annotation
    • http://lyshiying.com/d/files/330650014.pdfIn PDF document text
    • http://doreenindiatours.com/userfiles/file/48311233637.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609cccec79b44---61800813282.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/a705b26f8d47628eef618d9949476b9b/wotegobeviri.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160cafd65055f8---fegujogoziferukugoretimof.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/nemabodeforijewuzoperip.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/8e3f6e3e3b8a6614a8c4dc2d759681ac/woziwajipuzawo.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/95534702413.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/roguzonami.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608a84b2b2e85---zibemonosemofafurotukuw.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087b5f77621f---ruraridagerawewamajufo.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/9557e0ccf23045e55abc7e5db5136b62/posotomasateb.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/vcfblh8q0i774k6rdquk0apgl4/mibizikijeniwimasotaf.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/bc8e54d89f61f8889fbecf0459d4092f/luwufewaludizotatijaxol.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/6864c0bb0dafb8100d98c8d70c7c5d51/59957555888.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c044309886d---27942319097.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/sefutopasujamusajave.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/morunixejedoxup.pdfIn PDF document text
    • 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_off0000fd52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD52 17332 bytes
SHA-256: 842f7cc1d87368ae4ae852bd42a89cdafe52a24d151292280138aea449ff0ebb
font_01_sfnt_off00012a06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001421d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1421D 10608 bytes
SHA-256: 2c4f1e067b2ddfaa7442f737fa46ba43762bb00d587b96c2db067637afab7396

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