Malicious PDF — malware analysis report

Static analysis result for SHA-256 274b26aabeb431b3…

MALICIOUS

PDF

81.8 KB Created: 2021-09-19 14:56:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1829bbbf5d8d1d1403a2e383ae3f9b99 SHA-1: 58a37e88b10e821642e54d8eb91421d31dcd0f65 SHA-256: 274b26aabeb431b3ee1edbc24f93a29423c707b30842a942380634b842ca23e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating it is designed to redirect users to potentially malicious websites. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an intent to lure users to compromised or disposable hosting sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://garglob.ru/uplcv?utm_term=lehninger+principles+of+biochemistry+7th+edition+pdf+download PDF link annotation
    • https://wotfiles.com/ckfinder/userfiles/files/70443619629.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/tejugem.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/tosivuxinivazijokimopot.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/vesuroxigex.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/83045456107.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/3740276131.pdfIn PDF document text
    • http://www.tecnobor.es/ckfinder/userfiles/files/13713995410.pdfIn PDF document text
    • http://61kidsclub.com/userfiles/file/wasaguzevofugetakazotasuv.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0185c3faf---7032380761.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/vodotiluvazotuxezesavem.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/98346463111.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/66033458361.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/tiwidaf.pdfIn PDF document text
    • http://isotech.si/uporabnik/file/fogunu.pdfIn PDF document text
    • https://czus-lukasa.sk/userfiles/file/pelujexiwuf.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/76577197504.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/5118c5f787585ac844fab9217c84be67/jaferojiguzeregesumuj.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614700f0d8848---48092164334.pdfIn PDF document text
    • https://sarvodayasamaj.uk/upload/files/pibunulum.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/67089335962.pdfIn PDF document text
    • http://panteres.com/files/files/legub.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/nifive.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/ribego.pdfIn PDF document text
    • https://oancora.com/ckfinder/files/19947166609.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/90862606836.pdfIn PDF document text
    • http://tes-sys.com/uploads/ckfinder/files/20210912/16314056263548.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_off0000dbb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CB 16688 bytes
SHA-256: 43f637033274ed10454b277161cb5790881288b769efd32c8905162ba73ace37
font_02_sfnt_off00011e59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E59 11412 bytes
SHA-256: 2facb96fdc9ffc4cb5fa2016363f8c2050c5f045971d7f458561dbfb09792605

Open this report in the interactive analyzer, or submit your own file for analysis.