Malicious PDF — malware analysis report

Static analysis result for SHA-256 064651766d863318…

MALICIOUS

PDF

84.4 KB Created: 2021-09-11 21:15:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d14f0e99d6826c53c70f9c4030512854 SHA-1: 279e4b6edf2e87521beca58ef27031394d8ff584 SHA-256: 064651766d8633182096d8015baca941350c1a0105265c8ccef9b2569194c3a7
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URLs suggest an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://duongthuy.net/userfiles/file/jovobusawadiletinosu.pdf
    • http://yotlist.com/uniformkontakt/userfiles/image/files/83976896307.pdf
    • http://kibunajcc.com/ckfinder/userfiles/files/54374104343.pdf
    • https://stradatextiles.com/upload/ckfinder/files/43290852898.pdf
    • http://shangrilayunnan.com/ckfinder/userfiles/files/jivutudo.pdf
    • http://clairerolo.com/userfiles/file/xuvofojupidosisefoder.pdf
    • http://aaaexpressac.com/userfiles/file/10403471231.pdf
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/76309743338.pdf
    • http://gavionescodeinsa.com/userfiles/wuzerazarigavefam.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376eb14050a---tiporepewos.pdf
    • https://hoangvan.vn/wp-content/uploads/files/vemofazezimariwuzidu.pdf
    • http://nonstopsushi.com/uploads/files/20811906085.pdf
    • http://unseenadventure.com/userfiles/file/66348502228.pdf
    • http://3t-t.com/User_File/UpFile/file/20210902110255_bm9qb2thZ2F6b3ZvZG9sZXRhcGVmdWdh.pdf
    • http://www.kotolantopeni.cz/files/zasosagurogalefagulakin.pdf
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1631296190_b9566290bb.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161338f60c9597---61815002538.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af56c83845---xikilam.pdf
    • https://pointvirgule.ca/upload/editor/file/sixijurimuvuruxamo.pdf
    • https://emartdeko.pl/galeria/file/negubogadija.pdf
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/88469309356.pdf
    • http://ityab.com/cache/fck_files/file/jigubow.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=watch+london+has+fallen+123movies
    • 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_off0000e05b.bin
be402ad4baa588af52e9a8738cd394971824d0aa92ac97917c2dc71ecdebacf0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE05B 11044 bytes
font_01_sfnt_off0000fa0b.bin
9d0a7892b4da530bb3f2aa2354bf381c6c86a40ba7dd4fa51c87801f2dd0e173		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0B 19016 bytes
font_02_sfnt_off00012c49.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C49 16792 bytes

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