Malicious PDF — malware analysis report

Static analysis result for SHA-256 262aa4ed862e2bf9…

MALICIOUS

PDF

96.0 KB Created: 2021-06-28 05:58:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: bc040ece116acafbc9ea2a393bb9d259 SHA-1: 48ee9d2bef25309b46c8a09fe6ed3f9fa929b4df SHA-256: 262aa4ed862e2bf969215ee86d595c6151eb368400790f720b95d4996ad2e21a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely exploits a vulnerability for client execution. The document functions as a link farm, directing users to numerous external URLs, some of which are hosted on compromised WordPress upload directories, suggesting a phishing or redirection scheme. The presence of multiple distinct hosts and UTM parameters in the URLs further supports the classification as a link farm designed for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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=goals+for+self+improvement+at+work PDF link annotation
    • http://rustproofingottawa.com/userfiles/file/veremugevatoxoxu.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c38d0b133a0---64011349731.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16088e8e062cce---43625275755.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/2534988c1f2c8a39fbabdfcfc4af911c/82959070740.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffacf08b32---64041668086.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/671a06977d75cbcbf36a68daaffe3011/49156980005.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/gigaduxojemabokuxateror.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/nasunikuxu.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd0b1743f8---85812921861.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3abc8879b---soludexetitilu.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6b65aae4c---72426524511.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/gobotedelukafewo.pdfIn PDF document text
    • https://agatanorek.com/files/file/44638740906.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/tazupedusamaborijufu.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/lhiee06htmame0b5srqb1ueua1/laseta.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae6e99c763---45358611270.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/160748926130a5---wuzukagesidizajew.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/42930467864.pdfIn PDF document text
    • http://vote4dannybarry.com/clients/2/2f/2f5d4f67c16906f9b09010289963de11/File/dajaweruriteranep.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160977f4f7eaaa---2316234502.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/efc39134f9772f07e705f7e2de71fa60/bowagefifarugotadot.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b40f96e70f3---15695316909.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/6a4c9f9ac62521de42c8eb70ef8bbbbb/palazubofowebazunes.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210530121627.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA77 17084 bytes
SHA-256: 9ee259e0a786da3145d5ad814c43e09dafd697b8c82a0ffe230a174cce2f54a9
font_01_sfnt_off0001130a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130A 10804 bytes
SHA-256: affed63a57b7c0ab2f08dc6a15a931dd863e4982bae6144b3992a172d2cbaee1
font_02_sfnt_off00012c09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001441b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1441B 17084 bytes
SHA-256: 7ad89defefa8dcf8d6564ddb84f88df1ab0a8b7241c712455cff8a592e3e9f4d

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