Malicious PDF — malware analysis report

Static analysis result for SHA-256 64d10e208f6262a0…

MALICIOUS

PDF

82.2 KB Created: 2021-09-16 05:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3a13842440a7eada5cbebeb44badc750 SHA-1: fa9c332e40adfae6704c1bda2a1c026bf554c40e SHA-256: 64d10e208f6262a0c918cfd9723e204044868828f1f948f0231e8d18e82eed14
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm, with several links pointing to compromised WordPress upload storage. The ML classifier strongly indicates maliciousness. While no scripts were directly extracted, the structure and numerous URLs suggest the document is designed to redirect users to potentially malicious sites, likely as part of a phishing or SEO manipulation scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://drafthe.ru/uplcv?utm_term=andy+android+emulator+system+requirements PDF link annotation
    • http://unseretochter.ch/images/file/kapizav.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/35544222346.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/sixaponopubesorumexu.pdfIn PDF document text
    • http://dezis.ru/uploads/files/71314946213.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/81969835334.pdfIn PDF document text
    • http://langmypham.com/luutru/files/kimuwumek.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/retitedosoji.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16141fbad687d7---xuterorijodiberasosewexiz.pdfIn PDF document text
    • http://cwesp.biz/upload/file/75454807021.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/bf9r686jp9g3b9f3qbc1appic2/vanabarudilegilereta.pdfIn PDF document text
    • https://jdsliquorlocker.com/nbloom/fckuploads/file/35962541236.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161326b50d1c1f---82420694739.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/filulire.pdfIn PDF document text
    • http://podushka.by/files/files/kosubapagugajipeturuju.pdfIn PDF document text
    • https://siltri.com/fck_upload/file/13640298348.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/wodakinitakuw.pdfIn PDF document text
    • https://mandarinusa.com/userfiles/file/1630725539.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/3899cbe2ab9d477a82e72e4e893d07eb/37562472625.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/kexozidepesopiwi.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/sokexijasebuvoveku.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139523a06cb8---lesuxeg.pdfIn PDF document text
    • https://hoavily.com/uploads/files/14217808317.pdfIn PDF document text
    • https://b2bircruise.travflex.com/bot/ckfinder/uf/files/43163536390.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/sosireledavazosevelim.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_off0000dec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D9 16584 bytes
SHA-256: a4258cac7df60fe68306fa3e08b6af5c7a643ffe4f2ec8b0b5ed6241cfd72b62
font_02_sfnt_off000121ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121CE 10748 bytes
SHA-256: a1987b7a7167cd9dcfd7bf6937641abfe13e7e2e8344dc9e3a0f450a710780cf