Malicious PDF — malware analysis report

Static analysis result for SHA-256 5369ecb6c00d52c0…

MALICIOUS

PDF

82.9 KB Created: 2021-09-07 01:30:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: db7eb520f1aaa5318a56c4b416f85891 SHA-1: b841fee7ab7a4dd7f684ab6dd6d158a0e32df230 SHA-256: 5369ecb6c00d52c0fcd790e6b1a85c31e56b2001c2c000429e62212859ea3201
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host and redirect to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/a107292093feeafc7eba9be1a8a8fef6/zojinupurorujijoloripu.pdf In PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/9gr1ernk5s9v294iq7qj03lhep/dazij.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/67114706851.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108c035d40f8---kikiruwu.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/kujewujisekupasidunegozuk.pdfIn PDF document text
    • http://ecotrans.vn/upload/userfiles/files/bedopokebe.pdfIn PDF document text
    • http://whs1963.com/clients/7/75/758a827d59fb1c2827eec60421ffdc22/File/13483701659.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/kibisiviwilutewa.pdfIn PDF document text
    • http://isgsrl.it/images/file/45048388758.pdfIn PDF document text
    • http://ultrabeauty-ff.ru/userfiles/file/dubutenazamevogilutav.pdfIn PDF document text
    • http://ozari-ua.com/files/file/jimokuwododunosoni.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612871ad75909---69789172104.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/gogutodirukojawuv.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/83154775066.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/98071925144.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da6cd7483e---vagutinibevop.pdfIn PDF document text
    • https://fishboat.hr/files/puwofesilolajejufumunufo.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3895583966.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/vunusomotavisalu.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/rojumidazax.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/jopokuzodiwadidito.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/toxugaduxase.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/60836388685.pdfIn PDF document text
    • http://mcleod-bobbitt.com/clients/64742/File/megolerikujitulemog.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/0e09bd267f1597bb7bd27547bd956117/ralidemevaj.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/25866353935.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1498585f75---57035971434.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=cuda+programming+pdfPDF 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_off0000e04b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04B 10528 bytes
SHA-256: 6e071a1c4142fe2617b22f56306d5d9c68b0359f6b182ab45f79e54609ca2647
font_01_sfnt_off0000f7f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F2 17640 bytes
SHA-256: 7c6c301d5d15be5c6b13ccf2118c5980573438be41bc678d305abc9a47e5dd1c
font_02_sfnt_off000125bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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