Malicious PDF — malware analysis report

Static analysis result for SHA-256 79ae230c9c4b6dfa…

MALICIOUS

PDF

85.5 KB Created: 2021-06-28 20:07:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dcf65eb9f739252642895a50efcd8401 SHA-1: dc406c6bbb8730f336172b57a5d8d1f592782600 SHA-256: 79ae230c9c4b6dfa29c5f56fbf26b2fdfe6b3d58db31df8c77ad152d79a302d5
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of multiple distinct hosts and the use of 'formcraft' and 'super-forms' plugins indicate a pattern of leveraging vulnerable web applications for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2f0e47e36---84037279686.pdf
    • https://toppelletmachine.com/d/files/wadamanelomizexexa.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609becb5924d9---86961981975.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/doxavekamup.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607983bf2256d---51874928851.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/crv2v28tg2s8daoq67i69o5qg2/remafivovovadutenofo.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/0ebee75809eb1d3960369f1cee652098/28862628986.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a97b70cdb7---kepegaxisogurepete.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e355816ab1---40213697669.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/23vqd7nhbs6tg8uhtm87h0mvil/wemuked.pdf
    • https://perfecthospital.net/FCKeditor/file/disimosa.pdf
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/21f93eea072d6152529451287a792db1/77064269057.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/d3f68b93ebdef13a7cc98d47b8ac935e/kirunizipuvupeporid.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1606e67a5a207e---92062051797.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/25f372bd2df06ef1f425cce8d9bf25d4/25195537695.pdf
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/32ec208448947d93c0735447dfc0bfc8/98927845317.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090ffb1d9158---48582513743.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608614700100b---48059207982.pdf
    • https://ngusacdon.com/upload/files/bipujitanipegixo.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a3b111430---loberijemedu.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6db7ce689---sapafagegaw.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da5340ded8---15598792992.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c2939b20c---58670454499.pdf
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e72062901---gitofosomomegimepikolel.pdf
    • https://luminex.pl/upload/file/vatumasunevagimovub.pdf
    • https://allmassage.net/upload/file/20210624052125.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=unstructured+supplementary+service+data+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_off0000ebef.bin
0c49a91f5bfb5c98010243897b76d1e9f2003b423a4009e89771b28c8c5de8be
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEF 10948 bytes
font_01_sfnt_off00010557.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10557 16792 bytes
font_02_sfnt_off00011d69.bin
66ed9d6a9fe7da177f05231ef1ad305f21b5a2be1917fce8f4ac68df3d971ed9
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D69 16504 bytes