Malicious PDF — malware analysis report

Static analysis result for SHA-256 e69dc4b103597a5e…

MALICIOUS

PDF

72.6 KB Created: 2021-09-19 03:55:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 607b30b2bab67e29999e11cf9d033485 SHA-1: b400e19c787721ef59d3999c3675c3efa924480c SHA-256: e69dc4b103597a5e85e0fd81443fdf8abb663545e0881db178369a853966e0fe
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF document employs a social engineering lure, instructing the user to install a browser extension or update to view content, which is a common tactic for malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent. The numerous embedded URLs, many hosted on compromised WordPress sites or disposable domains, suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://queure.ru/uplcv?utm_term=internet+explorer+version+10+for+android PDF link annotation
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/suretimajekonew.pdfIn PDF document text
    • http://artio.pl/files/files/lomexedab.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/vujujus.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/93369978006.pdfIn PDF document text
    • http://sgrdinstitutionspandher.org/sgrd/userfiles/file/54440258553.pdfIn PDF document text
    • http://industrialdevices.in/uploads/geromaverovitetunotasi.pdfIn PDF document text
    • https://cargoservice.pl/cargoservice/userfiles/file/18672203758.pdfIn PDF document text
    • http://secondhandgraphics.com/usrfiles/file/44463688183.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/0755d01a868c36998808f29ecb987706/lemanag.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/bcf1iaoen8q86un8h756dd3tnn/96095326689.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/penilowomosoweb.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/58808681530.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/37302490173.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/4q163ori44lga7vo9niv9o41i3/43830593668.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/zabunuzukigazitifo.pdfIn PDF document text
    • https://suavitinhtannha.net/upload/files/mifulewonemovidaxat.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/5dcc6c94caec1fab55375947e4b32650/matonitumorokarevudemeb.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/pebanuzitolaz.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/28603265709.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/29068933128.pdfIn PDF document text
    • http://luatsugiadinhviet.com/upload/ck/files/vonafijegazuvitas.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/vusoxezilokefetumazate.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_off0000b7b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7B8 16908 bytes
SHA-256: 69a2a90aba011835e8ec5f0a1f500999bafb1735a852a8a6fb315364b1926b9c
font_01_sfnt_off0000e383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE383 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9A 10784 bytes
SHA-256: 5481ff84a75bd39adea9bc1b5fbd617485caf00f9da6b76f0acd7027d50c9fd1

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