Malicious PDF — malware analysis report

Static analysis result for SHA-256 0861904366d5d825…

MALICIOUS

PDF

88.7 KB Created: 2021-06-29 05:03:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9af35f2bf1904059b1f6963780977a28 SHA-1: 95ad4b20b0560e8141df59895235541d43d241bc SHA-256: 0861904366d5d8258e89404b0e17af75b1717d61f42d06e53864c925a5010702
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, exhibiting characteristics of a link farm. It contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting sites, suggesting an attempt to lure users to malicious destinations. The primary function appears to be redirecting users through a network of potentially compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://montaze.org/democms/userfiles/file/kuvaxerawomibawowiba.pdf
    • https://bem-sa.com/img/file/sasisa.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/dbtfshuk3aih8ls8tn8okkvf73/zetobem.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/3679ba116793c4b1436bb13cc1928e4b/13881061888.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/jldpp3plg79kho6brbev5si2pd/58579404530.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5f877d3a1---33167984629.pdf
    • https://stallion-international.com/userfiles/file/91922743903.pdf
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/aqvha550rmieq1bp42c6ph8u64/wewabugazive.pdf
    • http://pivotal-technologies.com/userfiles/file/90514614635.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e8ee6c15c---tasomatulikerib.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608e483b33803---3814781424.pdf
    • http://daoltrading.com/userData/board/file/71502480492.pdf
    • https://hoalavender.net/upload/files/54998165863.pdf
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/d96831cb3e537c8d9b2f14cc46717b82/63155376551.pdf
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/n99sk0s44ur3pgu40llcs8qefr/27260541079.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160986addde760---84928203947.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdecb8f07c---80900649970.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073aa6873676---koworikibojaxivabew.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/sjgcn4emodhkevmgi36dsohdj2/75869671249.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087827d093a9---gapimomezuxorumog.pdf
    • http://karunb.com/UpLoads/files/23971804727.pdf
    • https://kuraniterbiye.com/resimler/files/namaxesemu.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/a42b2d6dd342e179a40eb8a83e4ea735/28481282645.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7d2cceca8---27655383581.pdf
    • https://robertbah.si/files/file/pefimogi.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cdd8d2dcc8f---wabexunakeloredomiwa.pdf
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/3c3d89de6c92135f641121b5268e39e7/91788551099.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=magpie+at+window+meaning
    • 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_off0000f892.bin
9d10f62e6175d7af1504860ff162a47f7d094b5e4cc008e1e822e3bea7b4b2cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF892 17412 bytes
font_01_sfnt_off000125b8.bin
7bf5895f312c0150d86e33d31da9dec33153d399954c295f848975920d79c398		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125B8 10500 bytes
font_02_sfnt_off00013d67.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13D67 16792 bytes

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