Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e9bac54f34bde4e…

MALICIOUS

PDF

82.6 KB Created: 2021-08-26 14:18:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 30293dd4b4dfbb9275d4f3274d28ceee SHA-1: 2ba4ac37caff23765f9d39495cbcf5ead65a4cf8 SHA-256: 9e9bac54f34bde4e49fbd865462a395d019d844d79d20d473285962bbb3f5c0a
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The file's structure and numerous external links align with techniques used to obscure the ultimate destination of malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606e11cf9577b---tutefogagafawufinip.pdf In PDF document text
    • http://krzeptowski.pl/file/jinipeso.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/62782466757.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/genanekini.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/10179594692.pdfIn PDF document text
    • https://ikima.fr/uploads/file/lerokinevivenuxogitoxono.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/87404699325.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/11962327930.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/toxavazamitegifanijal.pdfIn PDF document text
    • http://araonline.hu/uploads/file/rulizub.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/16835753418.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/nexatemilim.pdfIn PDF document text
    • http://superplasticizer.cn/d/files/54473629025.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/55f216b297d24585e8fb495c9ac272ff/bujomatilikazes.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/0sd5humbudrjllljh6ev1f1hud/35756678101.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/53317163043.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/cac7117f8aa56a94eec74ef3b4b79c79/75559938838.pdfIn PDF document text
    • http://dashoernerboot.de/userfiles/81328142132.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/lukitoxumudomoxewibikobuv.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/30159676447.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/f4c0f13b8b3f75643f7313c32f1bde71/30093795481.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/mujaves.pdfIn PDF document text
    • http://beiks.info/public/file/merokelipejiwin.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/97713331780.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d4c14ba74---59780548171.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=download+self+declaration+form+1+for+driving+licencePDF 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_off0000e024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE024 16260 bytes
SHA-256: cfacb7be0e6284d28b4eb542c0296bcfe17580ceed6b6768db988e3d24ebf086
font_01_sfnt_off00010a3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3B 11024 bytes
SHA-256: d2d4be4cb97a4d408004020cc4f68950379e09bcc6fd4e68d1f85eaa1ee1e675
font_02_sfnt_off000123ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1