Malicious PDF — malware analysis report

Static analysis result for SHA-256 79fb08bcea40737e…

MALICIOUS

PDF

86.5 KB Created: 2021-09-18 21:59:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: da662d65d3568c0f1ff305f8f6cc90fa SHA-1: 2672622d0b920da857b232766ee5fd8b4ab95c7b SHA-256: 79fb08bcea40737eec01213465a5fe9c71dcce4ee91d66180dfae23b2cbdf89c
216 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It employs social engineering tactics by impersonating a cloud file-sharing service and instructing the user to install a browser update or extension. The document contains numerous URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the lures and the embedded URLs strongly indicate an attempt to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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 http://biometria.pl/photos_fck/file/gadasutibopizado.pdf In PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/34bf40e509a550ea793f2f0d317f79a9/migafokesiwujizomalufik.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322fa6937d8---65992165260.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/39775058290.pdfIn PDF document text
    • https://predial-rua-nova.pt/056-CovadaLua/images-editor/file/87258503723.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614577a02289e---81683492363.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/bizefiviwenejefapajamoso.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/8be0454bb7a0a10324e99b2915daf41f/mabamovefav.pdfIn PDF document text
    • http://chinalabware.ru/d/files/47505760490.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109140059054575.pdfIn PDF document text
    • http://vattuxaydunghl.com/userfiles/file/lideruro.pdfIn PDF document text
    • https://kaparatt.com/images/File/guwowaniwoz.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/tivasagafaso.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/jedenazu.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/71953626979.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/47736972413.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/47184529489.pdfIn PDF document text
    • https://dptech.vn/uploads/files/dulusiwix.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/dudiketemudaselud.pdfIn PDF document text
    • http://standardamulet.com/files/files/85210081314.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/debafuwatefuwoparinedo.pdfIn PDF document text
    • https://motecx.com/images/file/48783408948.pdfIn PDF document text
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/74340390700.pdfIn PDF document text
    • https://macjiboter.macjahisa.si/files/file/92299153582.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/4333865655.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=voice+aloud+reader+androidPDF 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_off0000ed8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A0 18548 bytes
SHA-256: 78e90fe8b41d394136a46ce643bfd94253edffa8d84352944d52dfa3c8735ba2
font_02_sfnt_off000135b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135B9 10164 bytes
SHA-256: 3d8ccdccb4aa1a675f6b5a7952bdb510ed448bef9097545b0885f65b51a4e2c0

Open this report in the interactive analyzer, or submit your own file for analysis.