Malicious PDF — malware analysis report

Static analysis result for SHA-256 d91a7a75892c5284…

MALICIOUS

PDF

160.0 KB Created: 2021-10-07 22:25:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 411212def08ed034189fc16afa1ce302 SHA-1: ae4a42953b728d4d8e153d93e950b706aa92d419 SHA-256: d91a7a75892c528471d27abe1f75249bdcf7137327743c6d5d3bca2c7b028d50
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable domains, indicative of a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to phishing or malware distribution sites. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/ba7695d60686fdd3086054dea287e7ab/93099924489.pdf In PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/22542803855.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/8941105215.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/koxer.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/71519745015.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/98403040447.pdfIn PDF document text
    • http://sipzip.com/userfiles/file/83046312897.pdfIn PDF document text
    • https://dbhattacharjee.com/ckfinder/userfiles/files/48086861880.pdfIn PDF document text
    • http://jingyitech.com/uploadfile/19618340840.pdfIn PDF document text
    • https://promenade-perpignan.com/userfiles/file/63661362218.pdfIn PDF document text
    • http://potlista.com/file/files/45147569648.pdfIn PDF document text
    • http://nazycakes.com/userfiles/file/56530702921.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/38534299701.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/dejoduwogulotiwunarat.pdfIn PDF document text
    • https://topconta.ro/userfiles/file/16575046545.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/lupenusolem.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/zutejilipavobofitowato.pdfIn PDF document text
    • https://avflash.nl/upload/files/gobonidedovukusoso.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/joxozuvurivixotevifu.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/ribanizewuvamamokejanonot.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614ee6fd1b607---21027666143.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/kajenasax.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/89634390951.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/sekivusapaxinimusajapibug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=there+are+none+righteous+no+not+onePDF 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_off00020b3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20B3F 21176 bytes
SHA-256: 78f95f96a39f10d2d6ac64009b3dcaabb491f1cac6a10315544d4c50e41bd5eb
font_01_sfnt_off000241c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x241C0 10404 bytes
SHA-256: 3c9b388b3ee0b6ddeb62628fe34268d3bbf23ff2763e223716e2e84cf68c41f1
font_02_sfnt_off0002594c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2594C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1