Malicious PDF — malware analysis report

Static analysis result for SHA-256 a14f1a2b20924256…

MALICIOUS

PDF

86.2 KB Created: 2021-07-15 18:20:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1c5af1f9ff98978006b8144e63f18741 SHA-1: 60a3e26ab8390ec3ca215a77b0563ee5445472c9 SHA-256: a14f1a2b2092425678f8e1752293b668611ece965d8925a4ff7f861fc61bef3f
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the final destination and potentially leverage SEO tactics.

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://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/a78312a5acda71cda8c72be45b5f59d8/logemesevimu.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609a07c19792a---mesaxefowukujud.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bf86cd828e0---sedoxesumasawokasemifip.pdf
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/e3488ed4ebbb12a7eec66c4f26a04198/79844104913.pdf
    • https://baobihungphu.com/media/ftp/file/95743240316.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/41083bb68ec4513c404d6341d20f0346/84514556105.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c82c8a0e02---97133115025.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1866e28b8---vafux.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/u3045hdhsjmo1ss5s8pf9185jf/50868824810.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d31c634221---gotizer.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd4bc1c4a1---wikatapojopusutipole.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608d28dd42ec7---tususopafusajavisovu.pdf
    • http://acpiindia.com/userfiles/file/nivejivasekeferelarazu.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608edbccaa320---matume.pdf
    • http://pincailight.com/zk/UploadFile/file/2021060418042573499.pdf
    • http://candientushinko.com/images/file/ropulupuxovakasezirelilof.pdf
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9aa8e376c---51794216060.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e66e9db5b92---45849937858.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160800bedb6a10---segopidofoleterawabamugus.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb37ab078b3---muvowaxipigo.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072afcacd943---wafusebawirezegume.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/455b6b49ce09cf1a38d2bf553cd569ea/58575226182.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=what+day+does+school+holidays+start
    • 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_off0000ee8d.bin
5c777aadc771a251bdb763b9083f9c414db8ca4eb05b9012d4c15feef423614f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8D 17296 bytes
font_01_sfnt_off00011b94.bin
d48999311e3854af343e9d7e7c807ebe4f7bd1bbcea69c38c3d618f57ccd8bd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B94 10468 bytes
font_02_sfnt_off00013388.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13388 16792 bytes

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