Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a515bdc1f091b11…

MALICIOUS

PDF

97.1 KB Created: 2021-09-10 05:09:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 76e67a405e052273bdea9bcc19018334 SHA-1: 9d9a780641ff5c862c7bbdacb89075d7b9b981cc SHA-256: 9a515bdc1f091b11ca510731365d04d46e1f5e5d47f1f5ba59d7d96510746a82
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to various websites, many of which are hosted on compromised or disposable domains, indicating a link farm or SEO poisoning attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the presence of embedded URLs and the 'SE_LOLBIN_RUN_COMMAND' heuristic suggest the document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://pappteam.hu/userfiles/file/30720730164.pdf In PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebfd216c4a---ketuvupopumapor.pdfIn PDF document text
    • https://dottoridegregorio.it/public/file/tugorejove.pdfIn PDF document text
    • http://kantipursecurity.com/userfiles/file/85140826142.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/82392003617.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/b893debc65758638f481b6452d3086ed/85311116855.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7a520cf2a---gawororitef.pdfIn PDF document text
    • http://gyogytornasz.hu/editor_up/24461319494.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/26967008899.pdfIn PDF document text
    • http://thietbibepnhahang.net/media/files/xamirilubavoxutenof.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/xonomigejag.pdfIn macro / runtime command snippet
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/rofutod.pdfIn macro / runtime command snippet
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56316293360.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/14151003951.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135232810d10---58182075350.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/44814544987.pdfIn PDF document text
    • http://yoron.net/up/files/sazegutelemifeziven.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/2cb7b53ee5461decbe03b003d93c7b4b/bowamopibi.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/46285509608.pdfIn PDF document text
    • http://espicycooking.com/files/file///82405028490.pdfIn PDF document text
    • http://flexa.cz/docs/file/6154804621.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/rewirewag.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/ludanigonakowogufulivume.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16136731a63e64---rukub.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-5/20210905000412640052.pdfIn PDF document text
    • http://thietbibepnhahanIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=audiophile+music+player+androidPDF 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_off000113d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012be8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE8 10876 bytes
SHA-256: 23d2c7ed421dbec8d5c6f88920370b80ac0887ece2daefd1d73754190c807171
font_02_sfnt_off000144dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144DC 19116 bytes
SHA-256: 33e94a2777bc08e99b17828281c5578499d307aad96287dab095cb54ae15fb6f

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