Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc59337db05d7d99…

MALICIOUS

PDF

92.8 KB Created: 2021-08-16 21:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: acd1972730a6d7c11eafbc1499e646e1 SHA-1: 809fae85e445b5a8e67d35d1a5c46316bc0a2c5e SHA-256: dc59337db05d7d9950b4193d3b2f06df83fd1fc0bb79a48fb4c312d2589d8a57
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maturitni-ples.eu/UserFiles/File/12376217804.pdf In PDF document text
    • http://stolizstekla.ru/userfiles/file/sojolenaxosejixeduwuniviv.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/zebosefopapezirogif.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/29099865480.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/0a3122b25039bd38d6bbe99db4b63349/80410741093.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/2189e27090b30a6f2f3218930e757b2c/tesirojevared.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f73f863c16---werubixilido.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/18486dad68f8482da362ba78b4e919fc/zulud.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/33004856664.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/xikupoto.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/xikefi.pdfIn PDF document text
    • http://mamnonlittlesun.com/upload/files/53417859215.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f39e08ef85e---mesepik.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202181605426379.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/baduvitip.pdfIn PDF document text
    • https://jotelek.hu/files/file/30547854495.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/01btm7lrts5hrm6rddupp92qci/99469612385.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/rozobogabe.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074fd0fc9ecd---xuguzolebakirenun.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/8967ea423c3a0d0299afbf68f6dd5fe9/najinamaboxowidukuxire.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/ff6aee7ee0f6e81d377e4a23dea9b3e5/73814106068.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/xalaf.pdfIn PDF document text
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/051c7bcd44d3c03767e9ebf956d5fd6f/pabukezutodizuvo.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609842fe5c5f1---gepinafewutozumelalaniz.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/56115470408.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/rerogurifoz.pdfIn PDF document text
    • http://brunsfamilyreunion.org/clients/e/e7/e70b0594429ddd28dfd4dd2f61c76e80/File/92453808705.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/e63d6a6fe567e231b08faea3b0ef3a15/bezesatebegeroromuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=among+us+ios+14+mod+menuPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e59d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59D 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516
font_01_sfnt_off0000fb1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11329 1848 bytes
SHA-256: e47e6365243b169ea3a170caf4e3c3954a8f7b82f998dab722cda564f21948e0
font_03_sfnt_off00011bb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB5 18428 bytes
SHA-256: 85f61b46189054ad0fe3157a38e6fa09ba6e02a6259bb7cb716c4f1e3af4603d
font_04_sfnt_off00014c78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C78 10396 bytes
SHA-256: 65b89e6ef7ec537911b5a2ce0dc4addd1f5e2ad8efbd7aa83256445c3a11535e

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