Malicious PDF — malware analysis report

Static analysis result for SHA-256 dddc2400685d2865…

MALICIOUS

PDF

82.7 KB Created: 2021-08-26 04:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4550c5a4238773c5bfa59baa195117e5 SHA-1: 29976e589e086e26c23562fd45494401a68f592c SHA-256: dddc2400685d2865d77d55f48e6e18f95db831498d959a3ae96519f0cbf20da0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and multiple URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/207s9f78mp992g16sha30it4e4/71494157380.pdf In PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/bijekeg.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/gumotikif.pdfIn PDF document text
    • http://yjccnc.com/upload/files/20734194892.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/26fc6938e9674c4a731b3d6d4b54aabc/wufajejegadorubeki.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/38819648462.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/zapukapiwowitakak.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/73470442441.pdfIn PDF document text
    • https://angkagenap.com/contents//files/76113911075.pdfIn PDF document text
    • http://dsagco.com/Upload/file/10423174091.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/sazojubimedunudenomuzifa.pdfIn PDF document text
    • http://doer-sh.com/Uploadfiles/files/47790152854.pdfIn PDF document text
    • https://nanosoft.mn/images/content/File/bozikujemelipavuwap.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/vuzofadim.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/fh45ckfjplc31cpt3o4ptd8631/79096367863.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/29347710339.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093e478317b8---20727312364.pdfIn PDF document text
    • http://contextuae.com/resimler/files/2013491934.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7bee24f55---xomovamogupanawiz.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16117cf3c8a6f2---31055265281.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/56142549073.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021052017233286.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad31159b24b---fajobumaxoxanulimojol.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/4167321686.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+create+an+avatar+in+vrchatPDF 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_off0000e2d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D3 10256 bytes
SHA-256: 103dc23890c49be32dc69d3e2da23fe9926fcb24fb4cc6dfcaaab30f06f3f448
font_01_sfnt_off0000f9d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E5 16384 bytes
SHA-256: 09354e946e73c7f3cac23a4b31d0b768af7dc5e279a71b3b9f9c78cd686b4ed8