Malicious PDF — malware analysis report

Static analysis result for SHA-256 c77d6c61a21cd375…

MALICIOUS

PDF

89.8 KB Created: 2021-07-29 16:48:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bb0bf438b5a0fd95f333512c52ab6a33 SHA-1: a337dbb697dcebcad214d593d5572aef04f7522e SHA-256: c77d6c61a21cd3759af8fe0d52536a80a24ffd2f320d9700af0c2ee2c005458e
196 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including ML classification and ClamAV detection. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious sites. The presence of 'cmd3t2d9ujg4ndf1vf3mjkm/52500408704.pdf' in the document text, alongside other suspicious URLs, indicates a potential attempt to exploit client execution vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://agcslohian.com/userfiles/file/14201342420.pdf In PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb60def1c9---ronaw.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/44055965030.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/72114623836.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e69a3b320---rupapagejodijupugoxeki.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab241332faf---gujibedasaxeninefajiv.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/7l8cmd3t2d9ujg4ndf1vf3mjkm/52500408704.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/29149847273.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/83245195455.pdfIn macro / runtime command snippet
    • https://www.asoriofrio.org/ckfinder/userfiles/files/nemijezux.pdfIn macro / runtime command snippet
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093aa95e509a---7675562042.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/78030434990.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/3a8492bad9857a0d6da9f3a412868590/61619036959.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/kemapukopiroxibewexe.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/8d7c19e7939d4306ae32be592b896e09/9817234433.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/81731512968.pdfIn PDF document text
    • http://yanartekstil.com/firma/files/bebekisukizupipinoxa.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/87ed0b97e1b9eabb3af626d5c3dd112d/67021840542.pdfIn PDF document text
    • https://topupdana.com/contents//files/wazapebod.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/38573253418.pdfIn PDF document text
    • https://ottopianos.nl/files/44847289721.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/70160458887.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/86d82db6cbc7bc86888bf00010093dc3/zulejerupomabagipitafewi.pdfIn PDF document text
    • http://liebherr-tr.cIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=the+cosmic+perspective+fundamentals+%282nd+edition+pdf+download%29PDF 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_off0000f129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF129 20024 bytes
SHA-256: e8f78be789d03dcf3a7c1b62d38bcb153ff66bf15fb9c7f199294d7c199a498e
font_01_sfnt_off00012539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12539 11376 bytes
SHA-256: d75e2bb691ea89c652e7e28f90f54a196b1538765f1e2344e6c34e415a9b9887
font_02_sfnt_off0001401a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1401A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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