Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b377552ffee51cc…

MALICIOUS

PDF

80.5 KB Created: 2021-09-18 11:00:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1ad23f35bb99c053bd5f92511a3f572a SHA-1: d56eba21a9b865f3d3803603ffc3bbb6715e94a7 SHA-256: 3b377552ffee51ccbe341360d187fde5fc57b5d45bad13252f4a64d05c7f8f40
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous external PDF files hosted on various domains, some of which are identified as compromised CMS uploads or disposable hosting. The ML classifier strongly indicated maliciousness, and the structure suggests an attempt to lure users to malicious content through a network of indirect links. No scripts were extracted, but the overall pattern is indicative of a malicious redirection or phishing scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/juxajufal.pdf In PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/89969442506.pdfIn PDF document text
    • http://hzeiger.com/userfiles/file/vebekokedobufolije.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/In PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/tabiwibu.pdfIn PDF document text
    • http://annabarons.lv/files/files/125606378.pdfIn PDF document text
    • http://maytinhnangdong.com/files/uploads/editor/files/6350216853.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/85453327199.pdfIn PDF document text
    • http://iiiemjobs.com/FCK_Editor_Images/files/mibizago.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/viforiguvozufe.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142593630d7e---tunamadixovebabezo.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021090417490273499.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/jiwenomuxi.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac4cb61212---puxijidefew.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614551022881e---81491319790.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139239ec6795---mewowisufi.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16142315c98882---65736544463.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/piselaluvumesox.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/medevomabeg.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/bisagarebosus.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/mikolan.pdfIn PDF document text
    • https://arbormaster.us/uploads/files/66599973020.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/d5a0n3e49vkto5buo1hpp3sljo/sigebofunisorebeki.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/50765527014.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/51717665578.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/3801551515.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=cara+cari+android+hilangPDF 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_off0000d93e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93E 17304 bytes
SHA-256: 82b4fc56d29dec73ea5754c7034a22814a3c5c223823ed71cb88c5174c53c79a
font_01_sfnt_off000105e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E6 10280 bytes
SHA-256: 0de53e1e0bd065939e1e248825b15c6ae001e7dcc51d7bf1037e33ecd903ba7b
font_02_sfnt_off00011ca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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