Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b93bfcac555828f…

MALICIOUS

PDF

72.8 KB Created: 2021-09-01 01:18:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fe50755f1aca92e22828a5ba5013e34b SHA-1: f61a0b94cedf01ad289c3df0fee98fc1537f9521 SHA-256: 3b93bfcac555828f07ff21e52d2140ba4e0def0f54154887cde831f4c07e9611
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting vulnerabilities or redirecting users. Multiple heuristics indicate the PDF is part of a link farm hosted on compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160781b7468d70---70343596586.pdf In PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/kafipoguforuxipek.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/luritapase.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/30e1e2cd3ff283f2c0afb28885ac20be/xukabogologo.pdfIn PDF document text
    • http://ktcz.eu/files/files/72786481700.pdfIn PDF document text
    • http://landpas.pl/upload/file/kosad.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/2996888645.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/130294938.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/tirigago.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/16070029537.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/78930186524.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b9d8679bd---73246646784.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/205a4340750235764e1dba04a0b9e89b/wevorokodu.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf2739c796---46543173638.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/xotuwifopabirewepit.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/s9c5a2a31nh5k847m8k2j2gbk7/43059194866.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/dcdc126bc2926d628c35ae4d66fad9a4/mififepirexegilimolik.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608736340dc01---32743827227.pdfIn PDF document text
    • http://cocoal.com/uploads/file/mekovusu.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/fofuluwezise.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/68877798111.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/jukisapipegokelivavotiva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=map+of+the+soul+7+concept+photosPDF 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_off0000b846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB846 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d05d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD05D 10528 bytes
SHA-256: 1d9c95c16dcb798262f9317145a27732b12f7a721d5e6d589fa7ff843953c695
font_02_sfnt_off0000e86a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86A 17096 bytes
SHA-256: ece7116083bdbcc7b7d52694eab38950387225fa8d8e5eef79c914e9b970eaec