Malicious PDF — malware analysis report

Static analysis result for SHA-256 0869b06b1f63774a…

MALICIOUS

PDF

68.1 KB Created: 2021-10-09 07:59:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5bb6cfe67925a33e6f68990dd005711c SHA-1: 5a2c188eb0786ed412a7fdedb21207048198c66c SHA-256: 0869b06b1f63774ae7bef58cb99ba8b7f9d76c2f3e7e3fabcfbe54a2f6aeae04
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute traffic or host malicious content. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the structure and URL patterns suggest it's part of a phishing or SEO poisoning campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://wastran.ru/uplcv?utm_term=what+to+plant+after+tulips+and+daffodils PDF link annotation
    • https://theptaynam.vn/upload/files/pufizofugejok.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/mawenexetixitovisuwufugol.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/lii93tr4rbpc0dh206mt973bd0/30312892596.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/61481624520.pdfIn PDF document text
    • https://xn--49st2et51duvk.com/upload/files/wesine.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/29409943416.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/30079323697.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/bopuz.pdfIn PDF document text
    • http://darslaska.org/ckfinder/userfiles/files/80437892416.pdfIn PDF document text
    • https://km2804.com/ckupload/files/15829672618.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614714b39c346---71532787496.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/buxojufokutefojivojux.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/55442299220.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/50287483892.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/67770398507.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613a93b0b64f4---bisupusek.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/72285440661.pdfIn PDF document text
    • https://grafconsulting.pl/Upload/file/nelexa.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/41642581933.pdfIn PDF document text
    • http://culfordequestriancentre.org/UserFiles/file/sesikisijesazar.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/57634871864.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/feberaganigib.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/peviw.pdfIn PDF document text
    • http://bamor.org/userfiles/file/26412390949.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_off0000afab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFAB 14152 bytes
SHA-256: 22cdca368f3ca9e04798a7c1a5a32e36107dd914215415b527fa5f4f56355cff
font_01_sfnt_off0000d288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD288 10688 bytes
SHA-256: e436f4cbc8a2fd5c3037040ab6baaab5b8ba9a3ddc9cfce420f0f80a1b45f857
font_02_sfnt_off0000eafa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1