Malicious PDF — malware analysis report

Static analysis result for SHA-256 e855128ea32e2aca…

MALICIOUS

PDF

84.2 KB Created: 2021-06-28 20:16:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ae6cab7e1f3a41ffc0b1c912fdf47568 SHA-1: 3f9353e0c02c49f689a6e3e26822b115dbac1163 SHA-256: e855128ea32e2acafa1d3fd2428acee421501f59166cf9801a01e6db09fc6de5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external URIs, many of which point to compromised WordPress upload directories, suggesting a link farm designed to distribute malware or phish users. The PDF's structure and embedded links indicate an attempt to leverage compromised websites for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://infrive.ru/uplcv?utm_term=involved+site+radiation+therapy
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a635625a2e8---fasasejirirupujupemu.pdf
    • http://househouse.it/userfiles/files/kegajijum.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160880237c0d07---jilitivi.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160736a020de1d---tovarevejaxomamanogumexek.pdf
    • http://harasim.cz/uploaded/files/butafusopuromul.pdf
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/nekixinejijatagavorewoz.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/0njkjq6rv93gct9j3847pn35b4/rifelerixiz.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b72866bdb5e---92584228837.pdf
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/92530f019ba4df8623ad16e25e537794/7892309891.pdf
    • https://bloomeng.com/uploads/43622276114.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607255573e920---44236627494.pdf
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/300a09a4572fe2552134802a6d0a1b94/139014820.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/1knmirdmsv10suvn45137h4e26/73247818640.pdf
    • http://bagliodeimille.it/userfiles/files/xudazuxokabanozewepusevex.pdf
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/t1oncvh02663pfs9180okm9fu2/60621885647.pdf
    • http://www.lugashotel.com/data/editorfile/2129737817.pdf
    • http://goldmustang.com/files/files/48814597480.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868038ad207---63754689032.pdf
    • http://bafiti.com/sklep/userfiles/file/puwewovigi.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c11f12e2bf1---7539393354.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/09df179c7c64d851bf476a595b4399e1/fanujegupirozibixo.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7b58034c5b---duloxerejilegejole.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/f749d1235015d556d71ba1943d2386db/nirazeximepejunu.pdf
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/fcd0733668475297345a42b3acdbed42/27785663379.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/oup0jfmj5q1i7bs5p9s0tbraf2/99762923504.pdf
    • http://alemotta.com/resources/original/file/32213056654.pdf
    • https://medlineplus.gov/radiationtherapy.html
    • 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_off0000e8fc.bin
1575c8555d00721008e0195c7cda4ac87693f42f0c77396bbc5a01ade66fdacc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FC 16312 bytes
font_01_sfnt_off00011321.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11321 16792 bytes
font_02_sfnt_off00012b38.bin
fe5f8c3ea3e3024a8b5b836a3b84aac4cbcc97a4600e3faa0914c6ab13e06d83		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B38 10620 bytes

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