Malicious PDF — malware analysis report

Static analysis result for SHA-256 8defa316fd08a674…

MALICIOUS

PDF

84.7 KB Created: 2021-09-05 18:04:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3bc7e2c72f82ca16868655d4fddd4d1d SHA-1: d051a0b5adf5b6660bc6beac49561604b601aeac SHA-256: 8defa316fd08a674e3811eadf64df3ff24523aa5fe4b203d1daaa8b042547423
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution campaign. The primary attack pattern involves directing users to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crysiq.ru/uplcv?utm_term=unseen+realm+pdf PDF link annotation
    • http://gopherandsquirrelcontrol.com/admin/images/file/65525114170.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7bf7be897---60121926279.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16108fa977b453---xaduxipovuxilizid.pdfIn PDF document text
    • https://thehero88vip.com/ckfinder/images_store/files/betodov.pdfIn PDF document text
    • https://rossbeede.com/userfiles/file/90306019127.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/81fc1688ec6af88c314533d781dd5e91/96872636192.pdfIn PDF document text
    • http://ayurvedicclinic.org/userfiles/file/ledatatuwoxom.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ab49c7f97---jodetevatewamiwiku.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/978f347aaf08bab9893b5bbfc2d67b66/3088912451.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a54b2814b---wudinekaxizedefuzutexamuw.pdfIn PDF document text
    • https://pacpartner.net/images_client//imagesfile/tawuzegademovatuzosogura.pdfIn PDF document text
    • http://nfc.soo.jp/file/28317192987.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/87bd7f545600e88413123c4f48451ce0/fokuraxejudopalukobes.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/rc5qmbedu3mjnjfbdn0uoumaj0/gulujiladupasifu.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/161127e64e231a---zevinabelavobugenovat.pdfIn PDF document text
    • https://himalayanespresso.com/espresso_ckfinder/userfiles/files/tivejivelosusugiro.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a18db7101a2---29782746026.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/br58eo3bml6hncsauteid5teu6/53898679893.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/48968772177.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210802180038.pdfIn PDF document text
    • http://okgwa.net/50/files1/file/kiroziwovezinapupewir.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/20936798336.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/derusazanewule.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608303e2ab5c0---dilikajeneki.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/tijugabedowumejuradovo.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A7 17808 bytes
SHA-256: afd49459c07e83bb3c755cb5a15f052d9a2f35ced353ffbf58e6a9cd9c347ade
font_01_sfnt_off000115e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012dfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DFE 10356 bytes
SHA-256: d9cb747c21e0e9588331a501a6651dc2900c91e42fc77a06a7d70b047f66c021

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