Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ef4dfa9a15e30b2…

MALICIOUS

PDF

72.4 KB Created: 2021-09-08 01:08:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0eecaef580f40303a844d4b12693f165 SHA-1: b319351981c2c919fb3dd647ab8bacc15f5ad1af SHA-256: 7ef4dfa9a15e30b2dd234c26931cefe2819144ad2f6930a14bf15961ced422f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly indicate an attempt to lure users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16074723e5bc69---78291246123.pdf In PDF document text
    • http://remaining-mc.de/userfiles/file/lasakofawofim.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/a5jj3ah5vrjqrjpumeugeh3ujn/75278910259.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0ff830827---dobugovinizujiwotomufud.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b502ef1a9---wafugiponu.pdfIn PDF document text
    • https://ebooksweb.net/files/file/lazakogokinafefazipebiv.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1fc87789a---dufud.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce56c8f0be8---21101888237.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/rijexaditavutuw.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860a6c2893d---powegewopapux.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-08-01/images/files/rekegujob.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/270f62b2eab1ce440443c88278743fe0/691985553.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/welumugebexe.pdfIn PDF document text
    • https://jogamiskolc.hu/ckfinder/userfiles/files/85093782295.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/11537797465.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/87666206924.pdfIn PDF document text
    • http://fittbike.hu/files/file/witapa.pdfIn PDF document text
    • http://brooklynsmokeshops.com/admin/images/file/joxaduzitaretafavi.pdfIn PDF document text
    • http://energcomb.net/cms_enercomb/sgi_userfiles/userfiles/files/2384891901.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b372e317f65---31877366927.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/doregowulipivib.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/5653944298.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/pemanivonomepojo.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210831100850814.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/15b3871ed5446db931ac6f81cda85bd0/sizujudovufinu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=o+positive+blood+type+diet+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_off0000bcb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCB5 15624 bytes
SHA-256: 7e89fbe48f812572b89bf349af780a9c649bb66630b6d3ea675c4015b19813df
font_01_sfnt_off0000e456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE456 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6D 10468 bytes
SHA-256: cdc8c2cc88b368cfd2cb45b2114bb9d3bed5653af62e1687149ec4b5e197ae1f