Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b1ecb08848b4ab2…

MALICIOUS

PDF

81.2 KB Created: 2021-09-08 08:55:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6193b7948a03d0acb442c60ddc8ea99a SHA-1: 42c23018f3393f01655e2d072711ce7f802e8783 SHA-256: 4b1ecb08848b4ab2740fed7cea1e62d4aad51b2d92221bf8e2d1bca89d0e1ce7
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to numerous compromised WordPress sites and disposable hosting domains. These links likely lead to further malicious content or phishing pages.

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 http://orderbestwings.com/uploads/files/58299946334.pdf In PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b20a39250---lunugunejibogojag.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/85160642500.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/xifepe.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/ropipibujubafi.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/abe2568867c9cf26cef380c6684dcd40/44275297652.pdfIn PDF document text
    • https://spacio.hk/attachment/file/ruvoranuj.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4b69bcbf9---91493629067.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/firobinefoseraz.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/kewefumatasugolitenelex.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/11248768673.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/7sb1u1g9rh5judr6ecoruq68ot/61295632909.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/ketezokatido.pdfIn PDF document text
    • http://premium-h.info/files/files/77652137737.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/v28ft9cth7uh23ehmotgurvbno/49383602734.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/41005631311.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160777bd6d0279---7790621478.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160900cd570575---puvefazemarim.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/ganipovovejudusevib.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613587d9246a5---kojuvoxuzebedajomuxasow.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac446bdec4f---22655400529.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/3152619355.pdfIn PDF document text
    • http://seja.lv/assets/ckfinder/core/connector/php/uploads/files/22272402905.pdfIn PDF document text
    • http://only-svet.ru/upload/files/16131188689.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=what%27s+in+a+name+worksheet+answersPDF 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_off0000da89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A0 10532 bytes
SHA-256: adb7248b88401fd7c8a00b955609165d6eaced89cf21fa25de680122a43c8c64
font_02_sfnt_off00010a8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8C 17228 bytes
SHA-256: 504de01041be438c72962dd9706b09b2ba1e7fe8ca2217be39b8ffe5beafae46