Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a4457a6fed6f788…

MALICIOUS

PDF

83.3 KB Created: 2021-09-20 01:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6846d4ed1d94903dd3a39c14e28dd3a1 SHA-1: f8143c1524b3238784cc6b09ac09320226931f02 SHA-256: 8a4457a6fed6f78882b2921c1a360fbca82ad7a87fb4e80a1be85068a24e6399
96 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest this PDF is a link farm designed to redirect users to potentially harmful content. No scripts were extracted, but the primary attack pattern involves directing users to external malicious sites.

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://ketchas.ru/uplcv?utm_term=pok%C3%A9mon+go+remote+raid+pass+1+coin PDF link annotation
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161424da64d9c0---moriwuwazadisifu.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/5caeefbe133db1c9a56097e5eb53c298/xanafazex.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/natajaro.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16138741c25eee---4847027094.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/46523418162.pdfIn PDF document text
    • http://phamtrangia.site/upload/files/disijivomowexo.pdfIn PDF document text
    • http://cnex.cc/images/blog/file/pekusineminuz.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/puzelixavew.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/53bl9n977u2ph9dqi1k2b3k6klm7fik5/86506497332.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/dukorojiboriloduzirulator.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/17452467192.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/9260534613.pdfIn PDF document text
    • http://travellerisland.com/files/jekugebuvalisabobuka.pdfIn PDF document text
    • http://wakabaeducation.com/userfiles/file/89736605155.pdfIn PDF document text
    • http://daiichigroup.net/uploads/news_file/mijavowirep.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/dalerikexemufikigow.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614222a90c208---jazazonurubiwosujekavowo.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/23739389096.pdfIn PDF document text
    • https://adikketiga.com/contents/files/99431679039.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/kizopiguxuxep.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/joxamopewimivanisozi.pdfIn PDF document text
    • https://maritime-models.com/userfiles/file/pumilikegorawafal.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/24701722071.pdfIn PDF document text
    • http://haokunchem.cn/upload/files/depodiropulibozutefufesu.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_off0000dc13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC13 11108 bytes
SHA-256: 4bcce33dc00b8c8844fa561283e5dab92380b21672ead80a3266fd24406db127
font_01_sfnt_off0000f597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF597 18452 bytes
SHA-256: f7faa2c88b3e0ef5b3eeba5a34cfc52d5be6fc7345827eb997b364a5b2bb8a66
font_02_sfnt_off00012564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12564 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1