Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7738cbb1cc51497…

MALICIOUS

PDF

87.8 KB Created: 2021-06-28 06:20:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3fd85a9cc448ad1148259dcb51cd6ae4 SHA-1: ba6df556409e3fb054d44a891fcd42f5b565d139 SHA-256: e7738cbb1cc51497698b2a57d964cb64593ae92917f84489cbd1bf04e87bc29f
196 Risk Score

Malware Insights

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

The PDF contains numerous links to external sites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to distribute malicious content. The heuristic 'SE_ADVANCE_FEE_SCAM_LURE' indicates the document's content is designed to trick users into believing they are receiving a prize or parcel, a common tactic for advance-fee fraud. The ML classifier and ClamAV detection further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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 http://attlas.center/userfiles/file/25365633784.pdf
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ad0ccf9e8---bajedaleraduju.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d283a8620a4---sojejugotubemudosifipu.pdf
    • https://laplacedesstores.com/upload/file/72800689280.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b24e4eaf633---94423860465.pdf
    • https://2ruoteexpo.it/ckfinder/userfiles/files/lifuzijanipefiv.pdf
    • https://99shayari.in/userfiles/files/faxewomojuna.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/327c786e31165da8e2893e58d01a4fad/kevizovi.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a1f5db13a---sukokiva.pdf
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/0c6e4664cfcc97af560869aac754c97f/nusupusejuw.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/sms37btd72q9fdf1a9larlh3c9/82963517479.pdf
    • http://samuiluxurytravel.com/Uploads/file/disex.pdf
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609060660744b---naniterududide.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/ntgutc1tjjktur0242ed9k6ksr/kegizenobilebununajiru.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/bee34519f0f99d170046bfe8df47237b/72610439604.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b579a655a60---gasov.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160776c9fe124f---73894446222.pdf
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16095f2af46654---75116413181.pdf
    • http://timandlor.com/userfiles/file/tavunega.pdf
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/92c6b58fac2380b8d5471b7495fada68/27315752626.pdf
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/kc54fg7tdt9f5el2ehdb58jnac/59887504211.pdf
    • https://anmoul.com/userfiles/file/nidigugepujozetubozibeta.pdf
    • https://tepihtrava.rs//files/53693789843.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=substitution+of+trustee+and+reconveyance
    • 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_off0000ef36.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF36 16792 bytes
font_01_sfnt_off00010748.bin
31e70e45d296aface40e5d1b1524b24e5b7f4bf573465473c7b47f896db22930		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10748 18012 bytes
font_02_sfnt_off00013693.bin
489dc734d3698a469a6114034871502fea0b6fdf4a266d79ca97b9d742490482		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13693 10920 bytes

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