Malicious PDF — malware analysis report

Static analysis result for SHA-256 1313be44cb5dee72…

MALICIOUS

PDF

84.0 KB Created: 2021-08-19 12:26:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 45d78ca448f12252984bc22789126d4e SHA-1: 66ca3b02fd88ce8dac2a1b3cce7cee02066097f9 SHA-256: 1313be44cb5dee727c700c32b60d4268e0ab52c48e07e6ea978cbcbfbb0a6018
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or appear to be disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern involves luring users to click on these links, which could lead to credential theft or the download of additional malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://agatanorek.com/files/file/60163409824.pdf In PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e56bd1a880f---xarolamupesesolesumo.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d23626a90f8---nimotigi.pdfIn PDF document text
    • http://tragiaocolamsapa.com/userfiles/image/file/2142353423.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/fidususek.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/34993960883.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/zafofifebunawenuzodifomo.pdfIn PDF document text
    • https://vicentinacentroautomotivo.com.br/ckeditor/ckfinder/userfiles/files/29330492049.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16083fb3f17c53---5508411801.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/7824fb57c685597fcec637a8b91be598/84705501082.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/26024863536.pdfIn PDF document text
    • http://canadanur.com/resimler/files/sunukoj.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/paxenewigujoduwer.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcee775339---89634766567.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/0b9ae65970cf263892ca149eee563c35/wodaweg.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1bbc873470---kepukoxejepu.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098854cec371---meledikatorabog.pdfIn PDF document text
    • http://vkp.ru/upload/global/file/37412292392.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/7552913076.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/11034139825.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3931e01b0---gipimabarotebuwasubovik.pdfIn PDF document text
    • http://shosholoza.de/file/dodetuwixu.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/65202047448.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=el+lenguaje+dela+seduccion+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_off0000e211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE211 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA23 18076 bytes
SHA-256: 510a3007c168f54915b4dc100d86ef018af36a67841d77a5817ee906121bf11a
font_02_sfnt_off00012787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12787 10808 bytes
SHA-256: 2a4f26866756fa21e0279b15c807c0439635e0fb4cb4670453314672e73f9e14