Malicious PDF — malware analysis report

Static analysis result for SHA-256 091bd901fa181cf5…

MALICIOUS

PDF

100.0 KB Created: 2021-07-05 23:45:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1bdb4bb8949ff9e71e022459be17af02 SHA-1: 67ec6efe41eda86757c80ac73305d114e8e004b5 SHA-256: 091bd901fa181cf5f7a184f520bb763ec105aaa3db1e203207b40243dda8991a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress installations or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF structure and embedded URLs are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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=square+feet+to+linear+feet PDF link annotation
    • http://datev.hu/ckfinder/userfiles/files/32414984665.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/34012705428.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/32d8ff672fb4aaaac9c1816997132479/39566914499.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071f45fea60f---19161385938.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/19143212218.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/39al30mks9e94c3n79uthuoqn0/80011570882.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/1vm9ppsncmoinj9f6rkq7aj941/37197855103.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/xakikoworetofebexulewew.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/d29836435763cef213011d7ab04ae2fe/61288706616.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/86587649131.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e65b4fdfd---bixesifa.pdfIn PDF document text
    • https://seerupit.dk/assens/file/tilobujisowoditirosipid.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/13863599978.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfc786ca7dc---4005788120.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/45872742669.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/zukef.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607240e8d1918---lelixetutadunat.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d392e99859---sozurawisebibotifelimadi.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/sqbi3pkkeoa3qcju347a9r85cs/44703113356.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/korix.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/hkp7fm94lusga10h8tslg41m1h/begilipixib.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021042820573573499.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/09c1e5c7e23ccef3586fc7702af5cf7a/24841570665.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/83674685083.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_off000123a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013bb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BB9 10360 bytes
SHA-256: 29de62fdbf9d13ca78c3ce4666318702a35d1f119f02b8153a1d589addd78db4
font_02_sfnt_off0001533a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1533A 17708 bytes
SHA-256: 66066945f4ea2106606056b6633a02eb0c6984893a599caab55ee5d9d146f397

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