Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bb5ca74396d8bc8…

MALICIOUS

PDF

85.1 KB Created: 2021-06-29 20:45:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 7ac52c744f67af7d6f49d6a9fa718460 SHA-1: cc708e14d90f78a522f488bbc0a2f9802549a821 SHA-256: 6bb5ca74396d8bc8cb7adaaef2f90dd757ff4434ac01e3b9195dd272fcd4efce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://coretry.ru/uplcv?utm_term=duck+and+cherry+pie PDF link annotation
    • http://s-privod.ru/userfiles/file/72101507941.pdfIn PDF document text
    • http://josephpowellfamilyreunion.com/clients/0/04/04c15d356d3082020e114f8c0300f46e/File/69656590105.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/42fc6ddbe7bc28ea25ef9c80be132ea1/lukajo.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/dupemav.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/xuxukevixuzigima.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/wuxawagaxerefexo.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/6oj52q4mpcra7o3vaq8t7h856g/94624648743.pdfIn PDF document text
    • https://ive-cal.it/file/tafidotutemuxi.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/63474cda0567373b593b59683f520dac/fazow.pdfIn PDF document text
    • https://strechybenesov.cz/content/90676402767.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/21709413971.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a4b62a4dd---pazulu.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/87926424106.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/ua44214a8cf79q08lch62dnhk6/negipujitexozuxolosekaj.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/tunuduz.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/buvisalirer.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b888615049e---6230847168.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/5241e9500ef6e52b52bfcc2738cbf836/fuzavixejavoruganositolew.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/kotirataxazef.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160722455c7233---78379343229.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a2fa5419d---navujikukezovirogirekuxe.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/206805848060a60e1edaeba.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/b7588e066378d49cb09bffd93c43a351/rafajudazimo.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7ff1ab22a---27281635082.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_off0000e816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE816 18188 bytes
SHA-256: f11dfb5bda1af212a8ae2c04790b1cde91e013ce8ef9a9a4383506928c44a591
font_01_sfnt_off00011788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11788 10484 bytes
SHA-256: bbce7bf6e80ec4ddad99feae4ec3f7ece56f2728ff8b8a8eb1d873efbb1f609d
font_02_sfnt_off00012f51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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