Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c21bca90ec3a07f…

MALICIOUS

PDF

81.0 KB Created: 2021-09-06 14:48:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b678f17a79a3496d6da7d8c87277eaef SHA-1: 0de4634491d286f01bd854dd9fc2b182b67a85c1 SHA-256: 4c21bca90ec3a07f7b9149978de8236323a7117dcde62f152deafaed7d4c36c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The file contains a link farm pointing to numerous compromised WordPress sites, which in turn host further malicious PDF files. The presence of external URIs and link farms on compromised infrastructure suggests an attempt to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://queure.ru/uplcv?utm_term=overcoming+exam+anxiety+pdf PDF link annotation
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612bf4b4b1ce5---miligujufokosuxiguli.pdfIn PDF document text
    • https://parokisantolukas.org/Uploads/userfiles/files/fozekibetom.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/38326420603.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/948a0f9afb9332f1e1dc9066921c824f/zesutigijepuvixuxufepez.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/48345637550.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/66796586162.pdfIn PDF document text
    • https://krygina40.ru/UserFiles/File/94297890774.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/52761966417.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/borekenade.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/texorubifezipifolemuv.pdfIn PDF document text
    • https://cyklo-wellness-penzion-palice.cz/content/3711185182.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/910a258df3afc354a60a3511c74c6e5a/zukesojodibebufigatala.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/94070382661.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607baca8d38cf---87829826116.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/porukozunaf.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607580271368c---68466375642.pdfIn PDF document text
    • http://vejwun.cz/images/40997086969.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/80050140593.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160716d8699074---ruxuvemekexuzatixadag.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16122041f27ff3---xajesuxiwit.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/68807137364.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/buwigikixome.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/wimow.pdfIn PDF document text
    • 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_off0000da5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF273 11056 bytes
SHA-256: 23ffb99e874cd16333869adde691ec31e24ec9c9c4e102704eebbe2c61eea90b
font_02_sfnt_off00010c10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C10 16704 bytes
SHA-256: fdc226b3ce4476413ed9868aa0da586adb410a71e7dee779f1b199b1a9428306

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