Malicious PDF — malware analysis report

Static analysis result for SHA-256 f56ea30f16ae0e1c…

MALICIOUS

PDF

71.7 KB Created: 2021-09-27 23:43:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c59b4e24aaa3b1872178a9e2732d101c SHA-1: f3622b7ccc40fe411f3c2f3b75646632d51a793c SHA-256: f56ea30f16ae0e1c69334baba5422d353138dffe915e03ab135ec90ef6e1d448
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The presence of external URIs and link farm heuristics suggests the primary goal is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://chcial.ru/uplcv?utm_term=flutter+deploy+apk PDF link annotation
    • http://cristal-in.fr/userfiles/file/sesaximufudatokonixunaga.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/98005537430.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/78248958830.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/895d49c9e9d6b43519570b8af69efe78/sajevigoginelunu.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1632405909.pdfIn PDF document text
    • http://bigbulkbags.ahmadpackages.com/survey/userfiles/files/rejupibakugijubajeruvinil.pdfIn PDF document text
    • https://slotpt2.com/contents/files/jusovu.pdfIn PDF document text
    • https://jatransfer.com/userfiles/file/nejetewanitigulopevopez.pdfIn PDF document text
    • https://konchris.com/userfiles/file/1631390213.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/vuzizogire.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/89417722894.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614908f6cf4be---fupazozuwadamag.pdfIn PDF document text
    • http://szwygs.com/upload/74933477713.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/sevove.pdfIn PDF document text
    • http://ip-malkov.ru/uploads/files/28762904241.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/7d092f2579a3683ef5fd7b87fb8cc164/balevatorafalovolidoduxo.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/30934901950.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-12/210912230659510557aspesbg3o1xg.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/winogiluj.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/zusujaxagabusopizapimum.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/numajated.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/bamir.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614964467f9eb---wuwepulaxuvovegeropukagef.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/tolekipivameju.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/1745653650.pdfIn PDF document text
    • 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_off0000b4c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4C6 17008 bytes
SHA-256: eafe6c829163d1f283fa9496b560fa694881b4dd863ac0ed0280b423cc84baf0
font_01_sfnt_off0000e040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE040 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF857 10304 bytes
SHA-256: d49134bcc1c1e23ec16418ae77888a8779895ea359aa733f9b97a4eff9a59110