Malicious PDF — malware analysis report

Static analysis result for SHA-256 64b7ca4a0af89c3a…

MALICIOUS

PDF

82.3 KB Created: 2021-07-20 18:33:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 433cd84c4921f7324e650132dd3f556b SHA-1: 8e7bf1b3cfae1977256c9073d19a42dd8dc3ebd9 SHA-256: 64b7ca4a0af89c3a294ad4b9b3b30f1eb0db727ebb25265c62bdba2979a4aa15
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan threat. The file contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting an attempt to distribute further malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/52aa5c0546f4b7d1746dd0045ae31542/75869542493.pdf In PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/3d189aeba151b754999b591d3ad89185/58858269221.pdfIn PDF document text
    • https://petek.biz/resimler/files/piwewimulupazuxuzipuleg.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/9139d880635ff790183f65bc7b4878f6/10767000472.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838d7a0913b---mafolojefutabufelovare.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/mulogidonizejopasi.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/foruvugamotanabawat.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/jqd9adkkfbnjroj8rngb5ffkpi/dilizudobosetake.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea07cb9301---wopif.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/79666097233.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/9d8cfbc519327a27353ad1023471b6f0/48662991578.pdfIn PDF document text
    • http://veitali.com/upload/files/tiponogati.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/de637096169790f37b8537f1435c1309/94688526784.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/nebujosanelodimef.pdfIn PDF document text
    • https://miruyuta96.ru/admin/ckfinder/userfiles/files/99456249000.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/41000622310.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/7pilr8rhj4f6ncivar1jbjdfok/topaxemoju.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b95c0a1612---velujatabuponusiweregudiz.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/wodalebomajinogorabip.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/juaai5idbl2cgtj7d1lo0sjljp/pedivokodonogeruxoduji.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160b8dc45e0294---24667237444.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/92251075258.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090aabeabebb---35172177318.pdfIn PDF document text
    • http://smitheaster.org/clients/861344/File/migeduximegedazegiga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=mermaid+tail+mods+for+minecraft+pocket+editionPDF 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_off0000d57f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED91 20064 bytes
SHA-256: f2513584b5eef28cab2f7bc9c386e76b9ba3974c1b0c3f82e8f659523f79e68a
font_02_sfnt_off000120cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120CB 10868 bytes
SHA-256: 54d8d91391f1bb8650021acc15cc2002d672b9cbf4db28bda5e0ca446d4e740d