Malicious PDF — malware analysis report

Static analysis result for SHA-256 0112dcd95df62b81…

MALICIOUS

PDF

71.8 KB Created: 2021-09-26 16:26:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c69f484f2ff518ee4c3563fe671e37bd SHA-1: 6b61a90af11ed3a6f06dcfab033853ae4d4823f6 SHA-256: 0112dcd95df62b8103cf992d2284ef867842e549b42b65a5cf0ec55d21a07fba
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and exhibits characteristics of a link farm, with many pointing to disposable hosting or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and link farm heuristics suggests the primary goal is to redirect users to potentially harmful websites.

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 https://smidgel.ru/uplcv?utm_term=shadow+fight+2+hack+titan+mod PDF link annotation
    • http://webinaris.blog/ckfinder/userfiles/publics/files/zufagatugewuvuxexalej.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/60427533449.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/12445767755.pdfIn PDF document text
    • http://7m-shop.com/userfiles/file/wesesoduwepu.pdfIn PDF document text
    • http://warehousetraining.ie/images/96717812342.pdfIn PDF document text
    • http://rideco.hu/upload/file/19707759462.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614f62439fd33---getelosuraku.pdfIn PDF document text
    • http://dalaichau.com/files/3120192482.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/79903181787.pdfIn PDF document text
    • http://www.ciesol.com/ckfinder/userfiles/files/76928016798.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614710111acd5---67468050626.pdfIn PDF document text
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/feduwiwuvoluvajumixukit.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/11220227463.pdfIn PDF document text
    • http://abcgsgeds.friendship-match.com/upload/files/92712262349.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/gibolipumatesuwa.pdfIn PDF document text
    • http://fu-xin.tw/uploads/files/202109022207228678.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/kijitaf.pdfIn PDF document text
    • https://ismart99.net/upload/files/fuwujaxo.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/23836366274.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/zigazawovunu.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614670a5c1ea6---lejerugexoje.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140fdd6c2d32---99188566070.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/takit.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/wozefejovowagonugupazili.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-19/20210919021433162097.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_off0000b391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB391 10848 bytes
SHA-256: 1c54032e709481bd65365041e613f2f68f1a53dfd8e52825155c49cefcd1d387
font_01_sfnt_off0000cc57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC57 17712 bytes
SHA-256: 1b9fd6c1808b83f982f5c81bf58b383c45b73b3a0e9a26529417a9f822e61037
font_02_sfnt_off0000f9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1