Malicious PDF — malware analysis report

Static analysis result for SHA-256 e22d4ea6a8eb25d1…

MALICIOUS

PDF

107.4 KB Created: 2021-07-14 05:32:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ca0f10577afddb69a4f69692c4d6366e SHA-1: 391de98b579f3d6bc98969cd9fd7ce4ef11eea89 SHA-256: e22d4ea6a8eb25d1abda765cc051630cba72ff093c5f464bd07aff61ee187a91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://cructi.ru/uplcv?utm_term=what+type+of+vegetable+is+a+potato
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b6fdcd176---48434878670.pdf
    • http://abwingsva.com/uploads/files/pirizelewoviwitazavi.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a940b8ead4b---ledokonaxalenulodolemof.pdf
    • http://wanyuantemple.tw/userfiles/file/kuxakomozabuwadole.pdf
    • http://delannahotel.com/user_img/file/11272327720.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/31d5e43ce7eecea2d9c740f9bac65400/89909707563.pdf
    • https://absoluteanytime.com/media_file/files/files/nizagugilabefiwugenajedug.pdf
    • http://myjobcareer.net/userfiles/file/2021052015314573499.pdf
    • http://absolutelyneon.com/userfiles/file/83593405495.pdf
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/2c5ec2a8984053338538715276ac5088/nokedipavu.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0a96d10ad---71812580753.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac29607e331---dipovogiwaxejaluzukamoxid.pdf
    • https://bda.ch/ckfinder/userfiles/files/netuxuruloxixutevoduwopok.pdf
    • http://kaithompson.com/userfiles/file/21097251671.pdf
    • https://arichaindia.com/userfiles/file/84051170522.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/ee628e1d5dfd1278f2416ef8ea2090d9/49091076263.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0e8b55376---79126436207.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/eff39a328a75fc55a2caead61c31048b/juxukegezowedivo.pdf
    • http://kapalishakti.com/ckfinder/userfiles/files/mogenekudigufotaz.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/fhaqdim94kv8vgsgl9po1v68t6/60357758427.pdf
    • https://infoenergie-loire.org/userfiles/file/dekale.pdf
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/91a53d364e79f9e86a40e837742eb67b/pakotavodigewubegonulo.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160afe8c431165---punupaxagomazuruvowosizow.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013fcd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13FCD 16792 bytes
font_01_sfnt_off000157e4.bin
2f6052769a3318b7223ee95a74261ee887fc5fc7c8facaa0ae10ed8b3ac5d5d1
pdf-font-stream PDF embedded font (sfnt) at offset 0x157E4 10744 bytes
font_02_sfnt_off00017094.bin
a977380598890ac86a1bb47e041f2f489c224257be172a16396454ced723fca5
pdf-font-stream PDF embedded font (sfnt) at offset 0x17094 17620 bytes