Malicious PDF — malware analysis report

Static analysis result for SHA-256 b89425dfd1f2a434…

MALICIOUS

PDF

83.6 KB Created: 2021-08-16 10:28:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 93322fae56bb1607ec104abca7afd5b8 SHA-1: 04f3e1b70e12198c7b66a5193a1db10e4a2e0f8c SHA-256: b89425dfd1f2a434f6580088005e5227e67ec37ecb1781b513ce28c5d7776917
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The document body is unreadable, but the heuristic firings strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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://bayanairag.com/uploads/userfiles/files/saxofekuboduvojixulu.pdf In PDF document text
    • http://kasystemofkarate.com/clients/861259/File/folulawa.pdfIn PDF document text
    • http://lhsclassof77.com/clients/34792/File/56420425710.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///44173102915.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/rukisojajifirinomev.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/14293300116.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/16efa9c52f25f303d18a05d8268a6e69/30115982811.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/jexituzuwexina.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/33823c97bddc4db2d040c79348a28370/21091004340.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/0e2d20ac0fb9aa5b78d68c23a64ff2af/46315244157.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/sijiwejajijejubigoza.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/8e47e472df1e6502e7554d390467c66b/jefibam.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/73aa95e04f97571d3b2af34baee95fb3/22272233252.pdfIn PDF document text
    • https://tpk-m.ru/files/file/darasawotafa.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/bfbnku99bcqlrbdl7o4gi846k1/pugotevajinavavaj.pdfIn PDF document text
    • http://runningrhinelanderrabbitry.com/clients/875187/File/28323236753.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/jarozefukif.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/65549617435.pdfIn PDF document text
    • https://ebooksweb.net/files/file/niletowananobuxus.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/12793117187.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/84a5858e4b1175a0e730034e12c52558/tuben.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/kuzikepirejasuniv.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0694388a6---kulegokunixejegalumosokus.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/kubokadapogukedamibizik.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/sakagar.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/babero.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=black+ops+3+origins+lightning+staff+codePDF 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_off0000e23c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23C 16712 bytes
SHA-256: e2455ebac0a9c12696ce503cccce6c3aa66f43de4f534e7222bee32294587ec2
font_01_sfnt_off00010d06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D06 11216 bytes
SHA-256: 655f8bd1346d7d29e300c83fd3779b55c4edb3c9939c205186422c69ccd41376
font_02_sfnt_off0001271b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1271B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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