Malicious PDF — malware analysis report

Static analysis result for SHA-256 181f5b2138367c6e…

MALICIOUS

PDF

91.7 KB Created: 2021-07-30 05:49:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 71cc60bd73e21cb2f53394a0a2284cf7 SHA-1: bf24112f617039d7284a7712eb5210592b1272eb SHA-256: 181f5b2138367c6ec6dcfff6ae1c6ac073156288438cb9f09704cc5526a3b0b6
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous embedded URIs pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm for phishing or malware distribution. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://pistant.ru/uplcv?utm_term=los+hornos+de+hitler+libro+pdf+gratis
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d6c13628116---67304905342.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076cd64e83e1---toferebinilerupilubawepim.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/a94336eeccd91e7a2667381abea59206/6933526141.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abead4baf76---xarakokif.pdf
    • https://propertiproperty.com/Uploads/userfiles/files/vogod.pdf
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608563c49d2f4---lizirawibewokinenaliteb.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/a2b232a8d4f55426391503b68e8c6d03/46974995604.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd9ee9b69d5---fapimumuvomutadu.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/2pcdev003ki8tooqutr5ngehk0/52223761263.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dde652065e---sixajiwetex.pdf
    • http://legendtec-eg.com/wp-content/plugins/super-forms/uploads/php/files/shpppbjqtgse8e1p0nnhpfh7f2/jatebiseronoxu.pdf
    • https://speakingparrot.com/upload/ckfinder/files/gujotuvigazarud.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27b78b3d7f---79018437689.pdf
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160bbaa5ba3f37---bafewupasukigabu.pdf
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/8a004ab81a304b670b0ec0ea8510d9d7/gejopawewegopekofizani.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/d97ee57ce0f6bd0852bfee3b2d5b0009/35512200766.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160700b379df4c---jasewalan.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/e56615e9a2ccdb967b7aa920a5e9e124/xalejisazufewedarar.pdf
    • https://www.dgaspcsm.ro/ckfinder/userfiles/files/33751764930.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/648b21ba58eb19fa90b30ca4688ee859/wezamomapejurenatadu.pdf
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608df7eca91cf---68773615707.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/8717amhfd9mncqk2dtsrctcja3/35890691359.pdf
    • http://ketnoikienthuc.com/upload/files/babupozusagudolegakejoda.pdf
    • https://szelvedojavitasmiskolc.hu/files/files/mebiwowetenofonoxesadem.pdf
    • http://backkwang.com/userData/board/file/51858484677.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8b0.bin
00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B0 16140 bytes
font_01_sfnt_off0000fe2d.bin
a42a7c1812c0ea171fb8094c22f1865d23438006f1c4bba1073f86ccbd478d97		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2D 10876 bytes
font_02_sfnt_off000116c0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116C0 16792 bytes
font_03_sfnt_off00012ed2.bin
4f2e04cbb0a078bf74802edd1b6a10e260164c9560b1bda2e36f96bdacd456ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED2 18496 bytes

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