Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddfc8b1a06545715…

MALICIOUS

PDF

82.3 KB Created: 2021-09-05 02:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c8c55fd84d1bdd85345ea96b308ed5d8 SHA-1: 4f72fb9b38f51f22d71745c46b258aa4094f312d SHA-256: ddfc8b1a065457150ebf768a480cde5d329ed0001a8f24c8e7bbae97f5c5e9e3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. Additionally, numerous external URLs were extracted, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to potentially malicious or phishing content. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • 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 https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079610639c04---wexad.pdf In PDF document text
    • https://ebooksweb.net/files/file/wubejitopamofevelasajediz.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160abe2e64ef77---tikefudojefov.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/lipixu.pdfIn PDF document text
    • http://th-hl.com///upload/files/75088593893.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/c774a1c9842395ea401585abc3010853/71735532128.pdfIn PDF document text
    • http://humanlitech.com/files/files/mokuporujotagijukaz.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/91863833917.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/dcc367669c0d51ef93e243b80825a99e/xojivida.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/12362656455.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/filopazakedokukekag.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611e522255190---90627478801.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/68398450565.pdfIn PDF document text
    • http://altinay-law.com/images/file/2096174203.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/84427198365.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/92430606770.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/dopimorevan.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/e6ff7dfe9bb4f8a078c99f510e9c2c6f/butikumewidolimofodo.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ea2d8a7d05---gizuxudalezazoz.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/fesizu.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/52c826874b8831a8935f4378ae6cd05a/61006015292.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/24925007170.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/34848246948.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=other+another+others+explanation+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_off0000dc3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3A 10720 bytes
SHA-256: 9df2dc4211f012fc1ee039d7cc503e4dc2e53959392b3bc7439ebb51c7e27beb
font_01_sfnt_off0000f4cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CF 18220 bytes
SHA-256: b157f00af197412d08befeba4ddd2b729519c0bdc25db39166e07e383df7ec28
font_02_sfnt_off000123af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1