Malicious PDF — malware analysis report

Static analysis result for SHA-256 58dc0ac06a63e055…

MALICIOUS

PDF

105.2 KB Created: 2021-07-04 14:46:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bcc3cb054d00d37afb61ed2b5b5b8f03 SHA-1: 66a9c578e3b0cc2d2ea6bff71a4d18c6c412ff93 SHA-256: 58dc0ac06a63e0559ca14b79966a8f88d2a13cefddbacf59a70e8ad8fe12b032
164 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many of which point to compromised WordPress sites acting as hosting for further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, suggesting it's designed to evade static analysis rather than convey information to a user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/7e67vtn218pl6peid6msj2er74/wifasun.pdf
    • https://autotronics.vn/userfiles/file/46290163195.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b4532937d39---novir.pdf
    • https://allcreaturesinc.com/files/files/nijexuwifizitopufawalut.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aae51f586f1---soboditigakivorim.pdf
    • https://an-professional.ru/img/files/file/84899559024.pdf
    • http://amblesidewindermere.ca/fckuploads/images/file/69299343787.pdf
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/19c4025c35be7c75412e6c6754cd6286/voporizudazusamefudif.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff52e2d879---fudagubotudituzatoza.pdf
    • http://cnkls.com/userfiles/file/1625332004.pdf
    • http://espacioschillout.es/images/admin/file/50080195584.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160c1cf129efed---bijovitiraju.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7bad9d852---11650934058.pdf
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608f152540885---kemale.pdf
    • http://nappsa.org/userfiles/file/xijegiwusimolewev.pdf
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/ca7358301d1719e7c8cc27ba88c5eefb/gurujafunuvugolijutimogek.pdf
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/ad1b354533c8812dd9b23bdbad05853a/levutajewumifisu.pdf
    • http://nguoigiupviec99.com/webroot/img/files/taretove.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7b835004f---bijatelasaxelonogozogin.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708a1703d36---nefavamuxabi.pdf
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/c44e8839ceb9caad451f69ad3f0a2854/kesokopuxojivu.pdf
    • http://botosani.ro/img/uploads/file/87262075677.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b6545f6accc---voriwesegusegajukemalowi.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b76e6de12da---niduvategubof.pdf
    • http://kadh.kr/bobod/upload/file/97780527780.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=business+essentials+11th+edition+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012160.bin
5f75525109a44ee407122063e533377bb670263fb67541af9fc6115546547b33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12160 16088 bytes
font_01_sfnt_off0001368b.bin
75ab9d9e3797b66296a926974f0d30326a15680c76245d378089d59c797dd7c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1368B 10700 bytes
font_02_sfnt_off00014f1a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14F1A 16792 bytes
font_03_sfnt_off0001672c.bin
de75a4a179b856c1801f4f219047e50b9dc674805625fda681deb1de41ba04c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1672C 17680 bytes

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