Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cf07129f3fefa0a…

MALICIOUS

PDF

114.0 KB Created: 2021-06-27 16:49:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2fee21d40ee1267e24e7a456a75662c0 SHA-1: cf6ea4007894c2e0dd7998ac9980885fc2af3dc2 SHA-256: 3cf07129f3fefa0aa8f95af743bbb3eb41e68e6c78ef1b0d556eb086cbd316eb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The document contains a link farm pointing to various domains, many of which are hosted on compromised CMS uploads, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the 'Fake invoice / payment lure' heuristic indicate the document's intent is to trick the user into clicking a malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://idd.no/ckfinder/userfiles/files/21293237502.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079aa35724fa---zifazarasazajuwajutoxu.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/ec4q6peqd1f44rj24ik21iier6/noxurulosewukilibilumik.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/8a5be9a749d867addb96300fa652c6da/17867600000.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/745956cf531ef17575a8954538d2662a/jofakafakuwofuzegezaner.pdf
    • http://verynailscm.com/user_img/file/rabizesuvavezuji.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c70e2b3fb---90849183013.pdf
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/de8vqapgfoljjpatpigek1j08t7st4il/27308152911.pdf
    • http://cnex.cc/images/blog//file/88723913666.pdf
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160812cc8203be---10385051983.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16082ab959d2b1---nanimom.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca146434f0---minefevigedatojupagabewi.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5663d3d90---rovaj.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb5cfa08b2---witubowokemavanujokipa.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607c574938823---62535704951.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751c9ab0a7a---jusajelekikojok.pdf
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/8384449898.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/0rjnr7lkiapbnokvjbigqqhn3d/lexiripekefokutuzix.pdf
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/fajodubiwebovukefisixesaj.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bc378f4a947---baxag.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078abe7d0e0a---dubefedejekasunufuto.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/29c0248b8c65f73a3f7848daa0af6b3c/gisinapemuzewud.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160881846807c8---nuloxadowebofapigogi.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/pihuhrcun3o9oc3slv3aqu08cq/zewenogum.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=philippine+national+bank+iban+number
    • 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_off00015cbe.bin
42993f9f915ba6491cbf1c0ecb305b681d57dd4de98bdb29b1fe69ab03c62237		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15CBE 10680 bytes
font_01_sfnt_off000174bf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x174BF 16792 bytes
font_02_sfnt_off00018cd1.bin
d8bfb9dd97490fdf915c2f0d5ebb15b58f1738ea61f7b030d62d94d1c2a4a61a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18CD1 17564 bytes

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