Malicious PDF — malware analysis report

Static analysis result for SHA-256 32e0fe39bcdf3562…

MALICIOUS

PDF

83.3 KB Created: 2021-06-26 22:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ffe4b4e6369610976829eb052ccc7708 SHA-1: efbe63f603a5be3ff42b56ad3fb99a24c1111276 SHA-256: 32e0fe39bcdf3562f7b69878a389b3057cfb216924416457752e87098b6613a3
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm for SEO manipulation or to distribute further malicious content. The ML classifier strongly indicated maliciousness, and the structure aligns with techniques used to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • 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://archism.ru/uplcv?utm_term=bumblebee+transformer+colouring+pages PDF link annotation
    • http://makingthegradetexas.com/clients/d/d4/d4716c73f098ea79da165a2194b6736a/File/34714335455.pdfIn PDF document text
    • http://tai-group.com/upload/files/98851067437.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845d03a127c---zekogefereteke.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f655967e9d---xelawedabugezonigegivodip.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/03ep4chnpbt3fba6ni48aafca6/naseme.pdfIn PDF document text
    • http://deryalvincotokurtarma.com/userfiles/file/39761159590.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/23644192176.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/842be6d7783a8c8576966925715600bc/86489190965.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d6d3ba8bb82---97413716341.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/12061032142.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/maferebuzem.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/p237qn42dq3lrhib8c0ua3u227/ribazeli.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/50t5uuog2fehi340e6t9rttc82/mofuvisowusapogilifiron.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd68ed3142a---42377117045.pdfIn PDF document text
    • http://gabortech.comadmin/file/ladakelunobedu.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/808eb7f1227f38a3a7c38293606928f4/podimagativuzef.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/21294812070.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb1fcd9d33---58455977446.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/25519967077.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/1448238090.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/7782415493.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2eeb18599c---46005029953.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_off0000e5b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B4 11116 bytes
SHA-256: 85af7e3d008233092956be099e2bd8e1f2c7dfdb8e39e36285b3acb887ba2155
font_01_sfnt_off0000ff6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6E 15968 bytes
SHA-256: c1008d6f75df7b950a2c543aed707cd1a4c66d5f91a757ab8f043abd352f8426
font_02_sfnt_off000127e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1