Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec8c4a383678bf29…

MALICIOUS

PDF

78.2 KB Created: 2021-09-06 11:27:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8ae8f911ac3358400d4605942f26d530 SHA-1: 32e2c908d74d1e8e514b540de90d37d726434dd9 SHA-256: ec8c4a383678bf2945abbe3ee4fd1f81963684c849e86a43ab6698e3b9ba12c3
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users into downloading further malicious content or visiting phishing sites. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160fc31c75d793---515886000.pdf In PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/574d21018eb46996e69ad37ce9410abc/5869133212.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/55803731786.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084f5f333501---tilenatunifuxere.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/84720356551.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a31a33c4ae3---48616110808.pdfIn PDF document text
    • http://nensi.si/upload/file/fogosowigezanagukaninib.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/v14j9jimq2nt81ips0mu9iivic/wiwupetumirisaf.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/unvv58arrbd7i15r5a47d1qgvq/kenopepipuvizunikuduwuben.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/rodaxeti.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/95113259947.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/9c3350654f87c3eea13a4f4427ac1cf8/27312249311.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/ketegovi.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/fewugafewimavanobelometi.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/50285414953.pdfIn PDF document text
    • https://pecsikult.hu/files/file/41103668408.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/42758918195.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a4038fb17---xunirozusidoduzuvowivev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=new+round+up+2+student%27s+book+pdf+free+downloadPDF 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_off0000c41d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC41D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2F 20204 bytes
SHA-256: 29c3418f99cf980b2434818d13b145702a4d8dc98e1b4903f17b22976b5b8710
font_02_sfnt_off0001120d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1120D 10948 bytes
SHA-256: 49330c056e732d23d78a69ad1b65644ef1f69f5bf7dc20615907f9dc307bb05e