Malicious PDF — malware analysis report

Static analysis result for SHA-256 49a2a18b58b124ef…

MALICIOUS

PDF

71.3 KB Created: 2021-09-24 16:05:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bc8a66717ccadbe32d9deb3af8fb676c SHA-1: dfad64b663a496bdbf5e1a3c8889bf9a63f6eeed SHA-256: 49a2a18b58b124ef192666d072aa6599c01943f2b28939b990c1f8e2fd519295
116 Risk Score

Malware Insights

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

The PDF contains numerous embedded URIs pointing to external websites, many of which are structured as link farms. Several heuristics indicate that these links are designed to lead users to download further malicious content, with some hosted on compromised WordPress sites or disposable domains. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://inwebjor.ru/uplcv?utm_term=android+lock+screen+removal+download PDF link annotation
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/121223099969.pdfIn PDF document text
    • https://kaisar168.com/contents/files/59152891869.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/puzenonedapuwixomu.pdfPDF link annotation
    • http://etpatatietpatata.com/userfiles/files/najodezez.pdfIn PDF document text
    • http://net-marketing.hu/images/files/9292904968.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/73004015696.pdfIn PDF document text
    • http://theprofitnesstrainers.com/userfiles/file/wutupaduvaketuse.pdfIn PDF document text
    • https://rajaunited.com/contents/files/41060602388.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/33207496577.pdfIn PDF document text
    • https://superchills.com/userfiles/file/31287074515.pdfIn PDF document text
    • https://terracell.info/images/file/9976337303.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/e7f73bf3caf66290cc6ea6c41aaed751/11350366488.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/54e4a6f6957f66ed66f262156c625fe4.pdfIn PDF document text
    • https://divetechmarine.com/contents/files/maxekuluroguguwunovuz.pdfIn PDF document text
    • http://chpcentre.com/files/file/52135502570.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/71406324797.pdfIn PDF document text
    • http://nayyaralidada.com/alpha/ckfinder/userfiles/files/59685280045.pdfIn PDF document text
    • http://dgkno.cn/upload/silemipinurufutozuw.pdfIn PDF document text
    • http://gardens-spa.com/user_pict/file/naxorixovevapodeb.pdfIn PDF document text
    • http://happy-land.hu/editor_up/52660712766.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/36096439564.pdfIn PDF document text
    • http://sun-tes.ru/files/file/sevev.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfdebe5c44---jejefutelaludebenajeluv.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161447a8b1af2a.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148510c4b6ba---93387106308.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_off0000b4e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E5 16592 bytes
SHA-256: a03e8050b6cb8e466baa5b1c072b8e2fbccc7ea2e8d06ca279a59d8fc321dbb9
font_01_sfnt_off0000deb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB9 10656 bytes
SHA-256: af4ca7ffe16bdb647bf15170846b5d6cf47ac4b2a93a83d49e46b451a240d076
font_02_sfnt_off0000f728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF728 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1