Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1b909d5b921e8ba…

MALICIOUS

PDF

75.9 KB Created: 2021-09-21 13:22:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 058c39a6703c4adbaff44223faf57346 SHA-1: c57d806c4c5d5144d38df3426501e11cd4764278 SHA-256: a1b909d5b921e8ba4c112a6c40b9cd02c977a3cad6d1b3597da890f74e3cc2d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://sculecuacumulator.ro/app/webroot/files/userfiles/files/2664643798.pdf In PDF document text
    • http://konferencii.org/web/uploads/assets/file/gekipo.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/4974564997.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/91005446884.pdfIn PDF document text
    • http://jafra-com.at/userfiles/file/jimisadi.pdfIn PDF document text
    • http://szpk.hu/_user/file/ditofol.pdfIn PDF document text
    • http://www.beautyvogue.ch/Files/file/petajagumufegoridujalizis.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/faa9e0603da42a3dbe29e933abe44cb3/womosuradirix.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16146ab108e60b---ralijibesu.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/54849974809.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/kuwidanugusurisajewerub.pdfIn PDF document text
    • https://branpc.in/ckfinder/userfiles/files/diviruz.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/69154917980.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/bujositonedukugopunaxob.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/5h8abksu2o04iq9estcuu8npn2/dokagolopij.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/temowodevanavofuxaza.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/xugobusi.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/20179083506.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/69275635220.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/j64sccbd9kefe5vpd9gseu52fi/5914870042.pdfIn PDF document text
    • https://sibirprokat.ru/ckfinder/userfiles/files/jalijemasideg.pdfIn PDF document text
    • https://intersat.lv/files/file/xefatixupuruma.pdfIn PDF document text
    • https://s-serviss.lv/userfiles/file/xulutid.pdfIn PDF document text
    • http://iuoooo.com/filespath/files/20210917210541.pdfIn PDF document text
    • http://envigest.cz/upload/file/65293419419.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=pokken+tournament+dx+download+for+android+without+verificationPDF 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_off0000c2ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dacc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACC 17536 bytes
SHA-256: daaf20db29d2cc17c4aa67e18d8bd0b799f4afb1569ca2e18e20a6f622cc8173
font_02_sfnt_off000107e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E8 11020 bytes
SHA-256: 3358a3c950ab223e1a4ded20d334c6b45ef79040212e22621ae4fd9fa330066d