Malicious PDF — malware analysis report

Static analysis result for SHA-256 45741ac769a65f09…

MALICIOUS

PDF

86.3 KB Created: 2021-06-30 13:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2733c62ad5d08146bf382299661808e2 SHA-1: 58be064cec19b21819ca19fbd200255eddb22446 SHA-256: 45741ac769a65f09d5250c40fdd5484954517d9394c086e19bf71f9c4604b263
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs pointing to various websites, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of 'LOLBin token sequence' and embedded URLs indicates an attempt to execute commands or lead users to phishing/malware sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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 https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/5gj384gcmd961ecffbuhqcg8av/79082299330.pdf In PDF document text
    • https://ehlibeytalimleri.com/resimler/files/95663495442.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/gapipurexo.pdfIn macro / runtime command snippet
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/cbfe4bd854d44641c724692487816b33/vopajusijifedasu.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/digazi.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/b3a5cda89cc6c5a70f75decb976348de/wurutomapilonevomideteme.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/subalum.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/nekobe.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ba13df9a4e1---nejenekadakonosadi.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/27354231262.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b056f32b17e---87508561403.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/4783e40375ef20ea62ac964851617f82/tesesaboj.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16079379d5a226---19252360597.pdfIn PDF document text
    • http://sansboundaries.com/clients/f/fd/fde0d4b6b324343791c5f0705b221951/File/32556391883.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/18420068515.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c56aa06b4bc---37723333654.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/dofideduz.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/4ce89b632ccee4a2f4123b6b33b756e8/67455885993.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/ravijatuwogonelesetixofeb.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608612b11a3a0---benewa.pdfIn PDF document text
    • http://heizler.hu/files/file/riwenulajejewasigag.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/55105996208.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725196e03a8---rikolazogivakumi.pdfIn PDF document text
    • https://ehlibeytalimleriIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=diastolic+pressure+high+and+systolic+normalPDF 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_off0000ecfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFD 17224 bytes
SHA-256: a6ae17b3e3ca7bdc7e7a5bf51ed64f3baa092eb50d74bbba68eec7c3dc2bbea9
font_01_sfnt_off000119b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131CA 11176 bytes
SHA-256: 7f0f75ca0faa1b3dd864e2b68b0309c2cc1ba4cca8844f3c086580a9122b0447

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