Malicious PDF — malware analysis report

Static analysis result for SHA-256 f279ad2996abb6d8…

MALICIOUS

PDF

84.6 KB Created: 2021-08-20 11:00:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: eb65e3c76ea80f227865739de0c265ab SHA-1: 9691984fd1da00c9e463076eb75f119de8c05557 SHA-256: f279ad2996abb6d87c8cc4af9de7926eccc1425aa76c323dd1c462740c2facb8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The heuristic 'SE_LOLBIN_RUN_COMMAND' indicates potential command execution, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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://coretry.ru/uplcv?utm_term=sims+4+bts+mods PDF link annotation
    • https://thaiwoodengames.com/files/upload/files/xopitazuxugared.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/75969196070.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/netewakifozalaxal.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/h5tvcokgdlf9plgv6408ukkimn/48489216418.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/2e58745a4654e71842ad15545ee5bbb9/60108587809.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e98d4d77c28cfe3f5411bac00b68853b/30518735021.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/39089740792.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/80009285554.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/19r3mncnt084t5np627u016gie/97255150283.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/defekasapulemuwobuvazin.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/dccibbc2eerfkf61cmd0u1otiu/21080025226.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b61eb83aa02---xufowowadadezivupule.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/50976087848.pdfIn macro / runtime command snippet
    • http://capital96.com/userfiles/file/lidava.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f2cf73fe8---butoge.pdfIn PDF document text
    • http://peak-experience-japan.com/bunujuzasewo.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/wurikirefavawaxu.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/vukipivawunezebexi.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d0924193909---11044873981.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6df6aae470---16104244486.pdfIn PDF document text
    • https://cffcommunications.nl/wp-cIn macro / runtime command snippet
    • 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_off0000e917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE917 16844 bytes
SHA-256: 5dd2545e12097f3bedb32ab63324f6064a6785cb255750e02ab01bc306d3af86
font_01_sfnt_off000114fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D11 10156 bytes
SHA-256: 0fba54112a0a036c6bf977afaf97bb24995d9f0f891f61c02bfa5906941b2305

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