Malicious PDF — malware analysis report

Static analysis result for SHA-256 c40cd0bbdca3097a…

MALICIOUS

PDF

89.0 KB Created: 2021-07-02 07:00:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b6cf8d237e1653dd13f9278c8846f2fd SHA-1: daacfc210c198b92036353137d107b1afbf5f9b6 SHA-256: c40cd0bbdca3097ab57e9691b6fd859a05c2ce462e320fe56354b03a1e697946
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs pointing to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to be a link farm on disposable hosting, and the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicates links to compromised WordPress upload storage.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://smidgel.ru/uplcv?utm_term=white+skin+discoloration+on+neck
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/19hngs2in9758gl57apbbvac25/pavenakatujezowetesito.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/bff809740798ec88f8cdf9231fde94e7/rupaxabonejaxudu.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/87f602bc9206112cdc626e8173d43369/jatifod.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/71712fe23e90cacb8e5b72cf4303e158/99186273769.pdf
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/f79e94fd8ab2985253aacbabf28dda15/38842057868.pdf
    • http://bike-aholic.com/UserFiles/file/diwomizun.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160723035e6efa---38847948783.pdf
    • http://garystrike.com/clients/3/30/301ae0ed988f9237e4cb8f8c41f6cb36/File/zadokedifazokojofi.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d0da42b8d---woketudeso.pdf
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607c14dd0893b---43229673796.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a35ff21220b---kufujuvejorenasomugatopef.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2be0c317d---faragikukivafogeza.pdf
    • https://esperanzadeavila.com/fotos/file/savavemagutowajix.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160ae23ec63f80---61902410534.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607182f143a7b---90830648535.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dbebb55307---varulesalanezu.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7fd5ae2bd9---66871259943.pdf
    • https://ikima.fr/uploads/file/xiwirigawezilix.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d985d6cc1a---96995375803.pdf
    • https://dentalrud.com/userfiles/file/gufopamozivimoxujux.pdf
    • https://cakenflowersonline.com/userfiles/file/sajulujaxuzutobesedobew.pdf
    • http://energy-labels.com/userfiles/file/lukikisitekagerip.pdf
    • http://kcobafl.org/ckfinder/userfiles/files/38199547485.pdf
    • http://antonioruizabogados.es/userfiles/file/morakemuz.pdf
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/2ee543ab4e5ee6bab1e3600f37ce7617/nibobe.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_off0000f982.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF982 16792 bytes
font_01_sfnt_off00011194.bin
234bf994abb83cb41ae218f17f2ed03bd916d8e445b72c4460fe2399c2095a19		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11194 16788 bytes
font_02_sfnt_off00013ce5.bin
cfc4416bceb4bed16c3e7efb00f2701f3a7a1f4a0eb6d9854af3aac54a5c8097		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13CE5 10552 bytes

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