Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff6bdf59cee73d96…

MALICIOUS

PDF

86.6 KB Created: 2021-07-06 05:01:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 74542a623ab0adff3ad9955e27bee484 SHA-1: dfefa4f799059baf0635ed0dfc68d35bc233c2f9 SHA-256: ff6bdf59cee73d96622a5e5172f6bb7442cb1b5bf4a4ea3f8c2ff247ce3726b0
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress sites and potentially disposable hosting domains. The embedded URLs suggest an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/ee29a947db11201be708dffbdc7e2bb6/49522722726.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa66827004b---40878054588.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c84c35e0dc---10280308516.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee2b33e663---tegojobufarig.pdf
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/b327e537d37e76ca05ea52020b22423a/57994291272.pdf
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/43669154074.pdf
    • http://bronia.org/userfiles/file/bubifutomeduvesar.pdf
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1269a6ce84---70472329632.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160810381aff0d---tizobafitufonugukifelog.pdf
    • http://a-swiss.com/upload/userfiles/file/xamoriv.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/7e9292dd95cbe1cff52ce62d1272951d/pedupuboborofopoxewowe.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805ed768ab0---31509355260.pdf
    • https://charterfori.ir/basefile/charterforiir/files/fizofifusegekixujuniwax.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/8d80907cab7d891afa3f8c686413f860/surusi.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/3a3d7a0fef027bb991050fc04b4f91b3/11089039685.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/47219e1cf1353a12800871249fe0dee9/dexogemilufixetusumetogak.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608664e0cc2f4---61936605455.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/19cbe6048413fa483f70e421069ffafa/22235835810.pdf
    • https://themis-lex.com/userfiles/files/rajulonogotubimewoda.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d54c232b1b---74588847891.pdf
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9fa8de47a---15379983568.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160afe207c9f8f---jubirulakuwarodikivubawo.pdf
    • http://186086.com/upload/files/zojemabed.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=gta+v+motorcycle+club+businesses
    • 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_off0000eb3e.bin
2cf241a6a8bb111ba8a95f7981e22050dca37896d8571796089908ff1dc1ec54		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3E 10852 bytes
font_01_sfnt_off0001045e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1045E 16792 bytes
font_02_sfnt_off00011c70.bin
d322da729e315f95e5d465f6686690d0a60dc2cc3ba0187679fceadb718a3d87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C70 18536 bytes

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