Malicious PDF — malware analysis report

Static analysis result for SHA-256 450284f2d44a1e62…

MALICIOUS

PDF

88.4 KB Created: 2021-09-03 22:18:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6a4c6848cbb10892d8de92fccf7d295b SHA-1: 8883dd6ca781ccd586a4f66e1f4e3f8d0787d21d SHA-256: 450284f2d44a1e62a3815323f5c7ebc13f73e1d34ca79527d84dfcbf9d4f89a3
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://smidgel.ru/uplcv?utm_term=cbt+negative+thoughts+worksheets PDF link annotation
    • http://orsolyajuhasz.com/ckfinder/userfiles/files/zumavopu.pdfIn PDF document text
    • http://techbis.pl/files/file/kogawate.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/30217597650.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160a24e121fb39---belorov.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/3f9e9978e1a4f6dd0b9ad6fd35cf60c3/suwafadaro.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/94557531335.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/parikasirerejawaki.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/61842252026.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/96172807120.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/sasarabalopupadafo.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/74857536715.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/wanupuloba.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/7495020317.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/5glhssjb7r10mqdadq9ut58fd1/lofamaviriramoledomopo.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/vko338321fess92i2ogflol2vk/38861119083.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/ruvuxi.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/34055953714.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/3b1ec9f11d7623c44ef9145c584a14d9/96077305679.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4c632cc5d---45580082466.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/qk9amr1rt6m079tui06n5o1d7c/86944227552.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ea97bdab680e05c5ad9243a1ba368465/75622639716.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16102d24d595bf---48081098832.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_off0000f0da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DA 19464 bytes
SHA-256: e5351fca50545310cb8bd6f7c3dac3a5d82fd181eee7446ef68f1f1b30efb0ed
font_01_sfnt_off000122d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D5 10856 bytes
SHA-256: 78baa5c9cbbca579e9ca244630cc1e8bdcf683c6093b2d65faba960edd9c6fbd
font_02_sfnt_off00013c0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1