Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c2bd50969490017…

MALICIOUS

PDF

84.3 KB Created: 2021-09-19 00:38:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4c33b96b3cf1049afd146aa80da71d0d SHA-1: d6bbab45c75a11a324c6879b61429b9e62ca9aa2 SHA-256: 5c2bd50969490017af43beae8c435de5f482904b99e8bc04fa7330e30685c042
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. The ML classifier strongly indicated maliciousness, and the presence of JavaScript suggests an attempt to execute code or redirect the user. The primary attack pattern involves luring the user through a document that ultimately leads to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • 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://lnianemarzenie.pl/userfiles/file/firikopowibinufatozej.pdf In PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613e618716adb---punezamerotovafisufejobid.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/3244479899.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/fukedusuwitupikakojem.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/nigagikamutajixasexiduva.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/22881475240.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/xetofojebibegobosukamox.pdfIn PDF document text
    • http://gensugroup.com/upload/files/sazixorimimiba.pdfIn PDF document text
    • https://lanegarrett.net/userfiles/file/49438612721.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/94200216259.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/tetumapewafoweresiravogup.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161369e5b18c7e---mugegukodume.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/5588165767.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/29805905465.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/66019470466.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/161456fbeda192---xogumofarebijod.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/basefirapekiziviw.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/zevalele.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614387c081ea6---56291727845.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c91a25a1e---tudafovodenezi.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/rafudemo.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/kilakobufowufitufidijiv.pdfIn PDF document text
    • https://sitarasign.ir/data/file/najivapoletazig.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/85237337127.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/sudexo.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141614b46414---67824803119.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/86768760051.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///66075087256.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=transparent+clock+and+weather+widgetPDF 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_off0000dcf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f50a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50A 19992 bytes
SHA-256: 5899751d1e45b7ef09e3e753f6342d107fad6ebc03397aa410f76cdea5443809
font_02_sfnt_off000129a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A1 10932 bytes
SHA-256: e7657464073e7e7c80a8764e607d199e19b6496e6ea57f026535c331b9c8deff

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