Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea9cdafa4b98b9b8…

MALICIOUS

PDF

79.1 KB Created: 2021-09-05 01:23:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: aa7771e662cc43426b19b693acb64f91 SHA-1: 43dd79cfc3f5c09ad78e3d7887b5beb9e339aa96 SHA-256: ea9cdafa4b98b9b83b625b35d9a2645908458bb9bb430949de68c31b1b682414
156 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, indicating it likely contains exploit code. The presence of numerous external URIs, many pointing to compromised CMS upload storage or disposable hosting, suggests a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://nomylo.ru/uplcv?utm_term=novel+pdf+islami PDF link annotation
    • http://copingconversations.com/userfiles/file/48594134609.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae06706fcd6---60949699148.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606de8c7b0ef2---68952166690.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/98441924149.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16086f23fb83ab---80500514874.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/12306549863.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/m96g5qnd494m8horfbloq7v4a1/wivobeduxo.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16087d659d0475---newowisebuw.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/19673998873.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/watalema.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/ncu4qgjel358bd3n5sj7pe8k2k/fabamoguz.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/13841274534.pdfIn PDF document text
    • https://irantruck.ir/data/file/xexeluv.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/3006316517bc05c4fd21d4e72f060766/novixadapulavuk.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/xilupuvifunapakazutawixer.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/muf2m4srobogbhe0f0rt6m43bh/14852751322.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/4lhut899qm7lapm2t6pega0lug/witujowexugosi.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/kotavevejukimumepesilipud.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/11291897159.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/9df517e9340c8512d1255532c2adcce3/nosab.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab54b78d412---xinurujukunom.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/xopokawenu.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a90d696f03a---gipujuma.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_off0000d3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E5 16684 bytes
SHA-256: b0fe0e32b37507c52c4f59103608be498abd6d095c1c63f08968c347484a5acc
font_01_sfnt_off0000ff10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11727 10400 bytes
SHA-256: 02db100a2b29e68df7e343d76cff00cee8f87fa6247e9fbe8a40afcc7883f285

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