Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9d9eef33d34dc2b…

MALICIOUS

PDF

85.7 KB Created: 2021-07-18 07:17:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f66eaf9ac263348bfb4e615597b36f49 SHA-1: 4946d9e58cd91164aab532fc2d71741a7c2a4bf0 SHA-256: d9d9eef33d34dc2beedc6a785aec4e6529a9562c7e59cd50f405f20ef4549b12
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to domains that appear to be compromised or disposable, suggesting a link farm or SEO poisoning attack. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of numerous external URIs and the link farm structure indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://954move.com/clients/4890/File/jeworamajoluba.pdf In PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/rukidofifiwolefirovevof.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/58526368405.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e73ef323ea---kadejurupekufiwilodawaw.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/sudevipalabigilaka.pdfIn PDF document text
    • http://ximangsongthao.com.vn/app/webroot/uploads/files/dukene.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/5408945589.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/sutavepel.pdfIn PDF document text
    • http://strandedtattoo.net/file/77130239893.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/q3qjk2bl97r3na63a4i5jkkar9/mekagunusawepi.pdfIn PDF document text
    • http://al-farh-iq.com/upload/userfiles/file/17274011358.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/c94692aa4e742852a31b1eea150a07bf/69369165642.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/97113547079.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c503b180572---xazuzudutuwebifurejajadap.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/94758694203.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/rovanidurevadizajisoro.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad01779ebb5---84262536269.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/rilolukomij.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/winokumer.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaea5433af7---68971889265.pdfIn PDF document text
    • http://asfcursillo.com/clients/879797/File/vujikozireriliripe.pdfIn PDF document text
    • http://therealmccoyfamilyreunion.com/clients/f/f9/f9ea119420dddc0cc5ac7622830b9f68/File/90588773722.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a268d06720f---wejupazufejijutesalimax.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af4f0445a92---tudafepekata.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609dce0e10a1d---9215747961.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/ue8c5r49iijshhfa9a4icofvil/65385695497.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=geometric+series+problems+and+solutions+pdfPDF 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_off0000e8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C5 11060 bytes
SHA-256: 506b82ef06b3ecd33b0bf2468dd51e60358a2c0775630e4c29aafda686cfdcae
font_02_sfnt_off00011a4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4B 17868 bytes
SHA-256: d08c5a9741a834eee7db3df4e9574477766a26cf43b8e62bc2657ddbee309d46

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