Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d4fc97c91ae1247…

MALICIOUS

PDF

79.3 KB Created: 2021-09-04 06:56:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2a8b0f72da754f39be787d67f361cbe0 SHA-1: 1e3e6bbbdbfb36580842a15975b25b9bf3e3b276 SHA-256: 9d4fc97c91ae124703e8d9ba5091658c1c7cb7f93165aafe30fe83f2a19aaa51
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF sample was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous links pointing to compromised CMS upload directories and disposable hosting, suggesting a phishing or redirection scheme. The presence of 'cmd' tokens in the document text indicates an attempt to execute commands, likely to facilitate the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/32bb288ddb9a0ca9c7d27cacda82d5bf/90272661710.pdf In PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/966plbjt8eor8fgllqrvmvkc94/63681772741.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/digod.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6ac810f9b---27488696683.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/27406781254.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/465016070.pdfIn PDF document text
    • https://digireg.ch/upload/10849917922.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/xefukajedejifilik.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/15697518357.pdfIn PDF document text
    • https://rivnerun.club/images/files/47148257896.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/fevumoxatinujil.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b3abf936996---lonatol.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/250350f615d3314508aed8488316cc04/91839864035.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609a883e0312b---lixisapovedul.pdfIn PDF document text
    • http://mtkshop.com/images/uploads/file/wiputagazi.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/27942121537.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/6fb25a707634d5bb928b9fd28f863023/12063480227.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/3s7tpqe74r593h04648l4n587s/niboxinefowa.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea66c46ab2---55019436576.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608db3f6cda03---85273965807.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/vsphcmdim0su1k3smg7rmp2tgs/69008893610.pdfIn PDF document text
    • http://josephpowellfamilyreunion.com/clients/0/04/04c15d356d3082020e114f8c0300f46e/File/51360808741.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210719_23C206E1E46559E3.pdfIn PDF document text
    • http://josephpowellfaIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=sample+check+worksheetPDF 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_off0000d314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD314 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2B 10696 bytes
SHA-256: 7c7a1af596d8ad9e7b454858a3a652aa93404ee244d2e3af38994e29af34d4bb
font_02_sfnt_off000103cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CC 17016 bytes
SHA-256: 145af0ba8e8ba64450bf63ad66e5c3932bb6f345e8266cd69aa7e3d50a52355b