Malicious PDF — malware analysis report

Static analysis result for SHA-256 5af03f0997263459…

MALICIOUS

PDF

93.3 KB Created: 2021-09-05 19:25:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: edf41e5836a20f81db24368d389b1653 SHA-1: 4224dff20415f574709d1cf44ce3488702ea2727 SHA-256: 5af03f09972634593a80e04917f175388d3664078aee3453b91262037c8a3c8c
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to 25 distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting. The primary IOC is a link to a compromised WordPress upload directory, suggesting a distribution point for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://fullcolorspandoeken.nl/userfiles/file/69891232095.pdf In PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/fca522042a44a292479f51aa6895ac6d/tigofugagefo.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/863664638e2009cae67b1884a609e94f/4162767121.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/15831304955.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/55617532193.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/mejosofonajabo.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/48908885845.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/875a5fde1f09e46cd772c11d3590c98c/26314162054.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/87009160997cfd862907dfeb733c4620/79389678767.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c0de5d9ec11---vugogodawoselabemekaxawuz.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fdc9bd9cd11---jukotefevonovupudawumub.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210823_A0BDE1368BA2B221.pdfIn PDF document text
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6d1393786---gomigiselupofesamib.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/vodubirukojapusugal.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/vapujajudepofa.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/90616647547.pdfIn PDF document text
    • http://paletydozahrady.cz/ckfinder/userfiles/files/zedubanulejowitonu.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611aed3d2a7f6---49678022989.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a57fdc1006a---68823238856.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/siremulomave.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/guxalagegafewogu.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/93464881753.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/pewevopivof.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160acf127cc814---ruwesibugujoket.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/tuargaluei817268ld4jshu31n/78015938082.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=sinners+of+saint+tome+2+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_off00010253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10253 20056 bytes
SHA-256: 7ec6872323988a03a1e760074a74c1e49d5676071ddce2b4f12a02f511997262
font_01_sfnt_off00013665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13665 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014e7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E7C 10808 bytes
SHA-256: 44ed9f958cb1463e16ab764ea9e77d469e516ba24fc7e5ffc495406f02f2dccc

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