Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dbd6034813ff7ca…

MALICIOUS

PDF

83.4 KB Created: 2021-06-25 15:33:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: f689121c94ce63ac45817ad264fa30ad SHA-1: 1128e9e5a8211d0eeaf9fefd423335280a841bd3 SHA-256: 2dbd6034813ff7ca9fccb23a9023ea18be31faae77c4b77a7cca8d16c52e4b3c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm or SEO poisoning tactic. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted, and the document body was unreadable, but the heuristic firings strongly suggest malicious intent through URL redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://arunimaflavours.com/userfiles/file/zupanopafa.pdf In PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f2a244286f43c9e08597df58497497e3/25641187205.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/rs6k6drgi666c389okdmfeo3or/64086777211.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/70523575016.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/91b678bef0c79724660c6142cafdae98/58756856206.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/vurofosenajesote.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/jepitup.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1622999816.pdfIn PDF document text
    • http://uppercanadatwocylinderclub.com/clients/877835/File/devilel.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/ef4d468da9ce35f62d9863aceadf57c3/dirixiwapaboxasavozo.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1624505300.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607be4dbe69ea---22539684221.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/f2f219991b49bad529ad9ba65cbf373f/36162352243.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/mobideporirebogi.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/901opbdkehierojeats0vnmgfm/67124800354.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/joruvulafubajumikufazokop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=saponification+in+chemistryPDF link annotation
    • 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_off0000e1c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C0 17708 bytes
SHA-256: 73bbf0a9b69faddf6662053db91e5737eac908e72ce1c3be3a8c3abd34d6aead
font_01_sfnt_off00010fa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA3 10888 bytes
SHA-256: b8fd4fe453cdd345df79c5cf697122768b9f0593fde0495554a002868d24b449
font_02_sfnt_off000128a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1