Malicious PDF — malware analysis report

Static analysis result for SHA-256 8de8f30272ae630d…

MALICIOUS

PDF

80.4 KB Created: 2021-09-03 01:08:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b5bb5fae4b5cd676cb77b93ca989f5a5 SHA-1: 28faa49f764f59d8ff61b3438fe218c7ee9f4436 SHA-256: 8de8f30272ae630d294212824edb164e1237706bb27b050e98a3541baf9bc4a8
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The document body is heavily obfuscated, preventing analysis of its specific content, but the presence of multiple external URIs strongly suggests an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://archism.ru/uplcv?utm_term=growth+mindset+quiz+for+adults+pdf PDF link annotation
    • http://biolabsrl.org/userfiles/files/49756781448.pdfIn PDF document text
    • http://easyhypermarket.com/userfiles/file/xorixozan.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/4u1mub9b2tpvhj43ku12anfabd/78623293823.pdfIn PDF document text
    • https://totalmediasolutions.ae/ckfinder/userfiles/files/63500259455.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/75872132664.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16075117530abd---44902236837.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/bexitinitezep.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/19776646147.pdfIn PDF document text
    • http://www.moyekolodin.com/files/fiduzoxofoxeboromenoza.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/33750718044.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e91f74a7c5d---7520053268.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c41fefe191f---zowumomi.pdfIn PDF document text
    • https://bevelec.com/bevelec/dossierMois/file/tofixizikuvatavifipo.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/94170976927.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/47996102520.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nivifaxomosisipojunomew.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/fa803ea039265b43267972ac30a94ad2/bawufobukilepuzovuxazon.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e90018f63---85975828099.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607271b5dc2d5---redetezurulu.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160ab77a41169f---86737009204.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///bakitexowenemibo.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/jaguwuwojenotoreramevif.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_off0000d38b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD38B 11192 bytes
SHA-256: fca97539e1e34813402b4543c8bd170b5a005e8ff9bd789869c6893277d4b8ec
font_01_sfnt_off0000ed73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED73 18000 bytes
SHA-256: 9929e564979953758336b98fc2c5d22f38cf82a3929faa1b96a634ef03297016
font_02_sfnt_off00011c0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1