Malicious PDF — malware analysis report

Static analysis result for SHA-256 640666c745091d28…

MALICIOUS

PDF

87.2 KB Created: 2021-07-02 09:35:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a49b7dd8caa1e769d72eb944321597ee SHA-1: 052019d974edf52591614500301e51763162dc0f SHA-256: 640666c745091d285b92bb31ef528b96e873d51ca765e43f6df939ed874c16f7
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, suggesting a phishing or malware distribution scheme. The file's structure and embedded links indicate it is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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 http://ladue62.com/clients/2/2d/2d0487a90c18d3a1b3df44839405a665/File/35912825984.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/mb1ac6dqfv7fsuu6ossnd9g1ih/16448831379.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160732ee8eed1b---luvuvat.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b459eb55561---68795619671.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607ada16c6bf1---15179238793.pdf
    • http://asea-admin.com/_userfiles/file/20210510010239.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607807fc02e5b---39304610581.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/7be260481228a7959fe3568ae4dea86b/70757511348.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607dba2cdc863---23070097373.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/tsead0nlckfo1lm3nhs6sqtuc0/28820579537.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606c947f08060---5859804736.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/86d073f8d0a8714bfa81f3aded626f1f/mapijisozatelametakad.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/90656427f5ac60dc81d6d97c23e04eb7/39001425971.pdf
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/5c11e8d897396135de6f562738093106/55048903564.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160875bb34c321---50356698776.pdf
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/be9ed24c9279d27ca4bf5ac31c36e367/11572575252.pdf
    • http://straub-online.ch/userfiles/files/xejuv.pdf
    • https://ntct-dz.com/ckfinder/userfiles/files/19958241409.pdf
    • http://weilandensemble.nl/ckfinder/userfiles/files/98053203044.pdf
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/41dad3b2b0ef45fb331e1b30b2c25b77/sogizugujisiwovusisufenel.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf91f52a5dc---gaxuwurukotejaj.pdf
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tolatuxef.pdf
    • http://gptools.net/userfiles/file/pogatoseronakopuwifu.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac97bc7b502---71528441626.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=corn+and+fennel+salad
    • 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_off0000ef18.bin
a534dd9220d0814fcf9dedd0b5476c2f0632ee88626060665ab58a08607f3d2b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF18 18212 bytes
font_01_sfnt_off00011f1f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1F 16792 bytes
font_02_sfnt_off00013736.bin
6a142e15028ebe3865b8cabb84ff008f1179ac5c5874c5fec1662c62fb181f78
pdf-font-stream PDF embedded font (sfnt) at offset 0x13736 10188 bytes