Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae4238d12ca41cee…

MALICIOUS

PDF

100.4 KB Created: 2021-06-29 13:41:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3ea9f2950b5abcbc900b2dbe16cd93f7 SHA-1: 2f3cf8996846bb3d9ae8ce6eeb83ca9d3fd4dad9 SHA-256: ae4238d12ca41cee1e042ab985a04663ba827e88f47f4544072f0b222e56f109
236 Risk Score

Malware Insights

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

This PDF document was detected as malicious by ClamAV and a machine learning classifier. It employs social engineering tactics, specifically a 'ClickFix' lure, by presenting a fake logon failure message to prompt the user to execute a command. The document also includes instructions for handling a password-protected archive, a common method to bypass security filters. The presence of numerous links to compromised WordPress sites suggests a link farm used for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9788

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/3abc2d966c4ce55e75c57eb5ccf65a54/58576828045.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/foo2m7ev0bcp36t9jodgp7dcg6/83752268103.pdf
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/6ba90eb59e3653c4416e12e408f40ccf/bumamatifanopipipotad.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/eagigjuqr8ena4fs4slvul3d00/19546278635.pdf
    • http://hpc1970reunion.com/clients/3/3e/3eb4c5728feca7eb79feed4eed44c519/File/natavamemiruxelezu.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609d19a01da2f---nexuxaxisawagorupewu.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd86f90134---84372260515.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608075070a246---77256935698.pdf
    • https://hoalavender.net/upload/files/68690106232.pdf
    • http://allprintusa.com/admin/images/file/54806944408.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/6rlhjdtd13h5o4fam61ovpf45j/pufaxopi.pdf
    • https://people11people.gr/uploads/File/rugidikunisatesetujugomi.pdf
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/17d75520abad06851526046a29879b1e/dejosola.pdf
    • https://cmoretv.com/userfiles/6295712589.pdf
    • http://rld-carbon.ru/file/54288144091.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ced0be3887---vamenurufewenivexa.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/52bb9c25f305b930926fe07a39c46134/mepibejoposekojewili.pdf
    • https://apinero.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607afffe6085a---zofukolaleb.pdf
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/fd94ed709ffa8dc4e42f61f1b50e6022/benipufupapiko.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2a414322d---66041947552.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b822ea4d667---3854433138.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef108e76a8---fositobid.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a15bfe57fc---90784761848.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a39523b01d3---gumonikosigit.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d11d869d0---44220732917.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=logon+failure+user+account+restriction+possible+reasons+are+blank+passwords
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed1a.bin
5488d20f3dce7358e1f023c2c40a7616420f6e49dbbfdf4182a0b64e4c2d354a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED1A 31056 bytes
font_01_sfnt_off00012f07.bin
78b2a534b674133fd48479b2b892460206796aea6d1dedeb7e22c6abc100eea0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F07 11168 bytes
font_02_sfnt_off000148ed.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x148ED 16792 bytes
font_03_sfnt_off000160fe.bin
d6e4d3f204449f41aec7e04c4f8651b37036c9839f4be330dc2fc4b33efb500b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x160FE 16236 bytes
font_04_sfnt_off000176e9.bin
55becbf9e8fb7c3b1bb33189e07c4b6a8c3ef36574e6decead033c360dcd6cb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x176E9 2744 bytes

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