Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c03f5103c746e41…

MALICIOUS

PDF

71.9 KB Created: 2021-09-17 10:00:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ec2a99156bef07dffd54abca5c6ab7e4 SHA-1: 67ca9fbce6fa4fd1a67c4f6f3ab068649c051554 SHA-256: 9c03f5103c746e41c0f292e41144beda2aec80a204d48a49d4954822c86c24b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and potentially disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://cructi.ru/uplcv?utm_term=dbz+dokkan+battle+cheats PDF link annotation
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9c0938cec---sanofugupivolifinupane.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613422b6bc506---48246554914.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16133a85299aa3---begivetiguxiwosevo.pdfIn PDF document text
    • http://bouwbedrijfbouwheer.nl/userfiles/file/24350442915.pdfIn PDF document text
    • http://bugskin.org/userfiles/file/nekikexulilamavolumaf.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/ruxavoperebipilazorivajex.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-9/20210909023518466531.pdfIn PDF document text
    • http://avtosfera28.ru/userfiles/file/34302495875.pdfIn PDF document text
    • http://herborgthailand.com/file_media/file_image/file/40177777333.pdfIn PDF document text
    • https://idroilektriki.gr/files/file/61807890123.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/derufekaxiledijorawo.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1613e61ea64f86---misutixu.pdfIn PDF document text
    • http://tuvanthanhlapcongty.biz/upload/ck/files/renisixebujibejelamuk.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/cffdb5261ced3e7c1ae90a0ffb860cf3/movujijepanibiluzovifanik.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7578e8c7d---58600380875.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/3rlp4ooqmrcd7vt54n3787p79g/pininolebirixewisov.pdfIn PDF document text
    • https://paradigma.bg/uf/file/43511811326.pdfIn PDF document text
    • http://sintjorisparochie.nl/userfiles/file/84118340999.pdfIn PDF document text
    • http://rsst77.ru/upload/files/34110700655.pdfIn PDF document text
    • http://sk4education.com/ckfinder/userfiles/files/39494160059.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/beguzuganisago.pdfIn PDF document text
    • http://funagamex.vn/PhuongNamGroup/userfiles/files/43437913305.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_off0000b7fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7FD 10568 bytes
SHA-256: a7490ec367d031a6b6e2a24a324b1eaee545191699bc9aa864e968e80cea299d
font_01_sfnt_off0000d01f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD01F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE831 16268 bytes
SHA-256: 1265b9d779c4697d803cca272d923af6898325e099578cb51c300cae48d0818d

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