Malicious PDF — malware analysis report

Static analysis result for SHA-256 df4563ae68ef0fb1…

MALICIOUS

PDF

84.9 KB Created: 2021-09-08 19:19:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4b58713b56bb24c489163576cf4d5939 SHA-1: a628a090df509c0bcf80c5635a6091a5505cb5a8 SHA-256: df4563ae68ef0fb1b4b73e3c64b392e8366de1dff9644f542f3f7efae22758b6
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on potentially untrusted domains. The ML classifier strongly flagged this PDF as malicious, suggesting it's designed to redirect users to harmful sites, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://proreferee.ru/uploads/ckfinder/files/biteminosogu.pdf In PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecae61f25d---garipigarimafosed.pdfIn PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/1794667200.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/xakokepido.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/542628728.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/ranopuzas.pdfIn PDF document text
    • http://rowadhr.com/app/webroot/upload/files/16095561875.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/34496556946.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7634eac140f5e0d68328c6ac3cc4fc16/4281229387.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/sewufofosejuzamoga.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/17304285460.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/banaxokogexuvaze.pdfIn PDF document text
    • http://phone-server.com/userfiles/file/wofedixoxubunape.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133631db1232---nefar.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/nowuporav.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/vjsj09ipu59jcaqiea28kcr8at/1704246772.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/24648803027.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/renujulunumuf.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/27134646852.pdfIn PDF document text
    • https://bdlvn.com/steel/upload/files/sopamobixubi.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/rilexavazederibis.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/94425506926.pdfIn PDF document text
    • https://xn----7sbabak5aIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=thinkpad+p53+manualPDF 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_off0000e730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE730 18436 bytes
SHA-256: 16993d09b8740d9741aa0f1a30425783add3dbbdef594d2bd52232c6715986be
font_01_sfnt_off0001171e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1171E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F35 10500 bytes
SHA-256: fcd5b7d9d421c71c881e019497d9c0df0a06f7ec6ddc56301e8b35e9f4b27380

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