Malicious PDF — malware analysis report

Static analysis result for SHA-256 5af5cd1fe0bbfc23…

MALICIOUS

PDF

88.0 KB Created: 2021-07-07 14:15:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c79ae27ebdc0be74528779158260719d SHA-1: 713546b6d569fa78f6115520519d7d485537d9be SHA-256: 5af5cd1fe0bbfc2380f7cd4811831828996768e10f1782aace393a977947c44d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://ketchas.ru/uplcv?utm_term=how+to+make+purple+oil+paint
    • https://glycocalyx.nl/userfiles/image/file/zozegoferifugiwi.pdf
    • https://dalilak1.com/userfiles/file/gekusinapi.pdf
    • https://tavio.ru/files/file/duguzevugajisojatisuziwe.pdf
    • http://assessmentinsight.com/ckfinder/userfiles/files/xotagatesajudufawi.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/5a487e5d0766def3e6559d897bf806d4/wixovanulamisafi.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/83dffcfcda63455520b52f2cb72b109c/40203458485.pdf
    • http://xboxheerlen.nl/userfiles/file/pisaz.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16095bbd23045e---34866303204.pdf
    • https://memoservicesrl.it/file/23924309971.pdf
    • http://reunionclass.com/clients/7469/File/jamapowofotosoko.pdf
    • https://optimustelecoms.com/ckfinder/userfiles/files/tipopajozamumobolelag.pdf
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/91e02f7f2b45ab4b2f00b47d85ec4d44/jojebofogo.pdf
    • https://villatoscana-pi.it/userfiles/file/30298109366.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af23a55eec---68146808592.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084275de1f84---25383657539.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/tl82o3f355ot61mblrhok7homb/9017308765.pdf
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/ddfee0252e566d9be3b16db39143a2f2/84405225211.pdf
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/nj36d4iktb2hn82hj87tkc7g37/nemopevudowivadax.pdf
    • http://bulk-supplies.com/userfiles/file/lasejaparopiva.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a081e6af73e---3148970639.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/d74999oueo6ucisg5njc1tnqr6/nemevi.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/4d50e128e2918b44d817080f8616f616/93601674041.pdf
    • http://logisticsnetworks.net/ckfinder/userfiles/files/jumuvuwemokiwatorafeve.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f647.bin
4d675f793761cb9da0cd938eb2aa987bc00ec50deb2433ae346d46fca8489d3f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF647 10516 bytes
font_01_sfnt_off00010e20.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E20 16792 bytes
font_02_sfnt_off00012632.bin
804f87e35395bf5f4f71d6818bc3f568a3e18138809f520e9405d7ab07e662b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x12632 17328 bytes