Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff7ad1331f4b60eb…

MALICIOUS

PDF

85.1 KB Created: 2021-07-08 11:37:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 38b576b92aa4ccbc3c051772f3cf6603 SHA-1: a3b90d595cbdb11dba741437a708eb11026ae207 SHA-256: ff7ad1331f4b60ebb28995effd0e6c0807ce70b99b20a36fcc1b3e692e70d240
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains or appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest a malicious intent to redirect users to potentially harmful sites. The ML classifier and ClamAV detection further corroborate the malicious nature of this PDF, likely used as a lure in a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/uplcv?utm_term=glaucoma+in+huskies PDF link annotation
    • http://wib24-admin.de/uploads/file/20166032268.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/73692611339.pdfIn PDF document text
    • http://huiking.cn/uploads/file/111218066814.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/5a0edf0038f6d865fcd78d1861dc3dc8/tozarozofewifer.pdfIn PDF document text
    • http://penzionklara.cz/userfiles/file/narez.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/lusurazo.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/3284868738.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/af2ba6e5f8d829a12f4340a993fe080a/60458909352.pdfIn PDF document text
    • http://attlas.center/userfiles/file/tutusisupavidixuneguku.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/eb526313d35cc797e6a7ae4f8aaf7c52/95086412566.pdfIn PDF document text
    • http://instandee.com/Images_upload/files/xoxosegero.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/52943190094.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/205a4340750235764e1dba04a0b9e89b/wevorokodu.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/lg3t1ni5ejshc48t5r73fekho3/lazixemaxotopatenadunedaw.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0ee63c57c---13043272183.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/1ntvk9vjf62hel453rmofrbfof/vixekibale.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b73795394b7---23749087720.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/wuwawezol.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/27490721106.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/c9424ecc64895aa4d03b2096c4b2d7f2/45129418196.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c60bcbbfd---sopasudevila.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/plb9aoecar9lofqvs2u49fb6fn/51638255614.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16096afbe4508f---fekoxurejule.pdfIn PDF document text
    • http://adveotec.com/img/file/wubelemedawugasujateka.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_off0000eb20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10337 10528 bytes
SHA-256: 34b32e39d11b12bd414e4f97a31a379c13dbd7d6203acf70bafe95850ca1d504
font_02_sfnt_off00011af5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF5 17016 bytes
SHA-256: 80f68630a914909396e5a31310e7434a009a5cc3c51a9c56e4258b7bc88a501e

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