Malicious PDF — malware analysis report

Static analysis result for SHA-256 e66669ba0d16d74d…

MALICIOUS

PDF

83.8 KB Created: 2021-09-19 09:31:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 09f9d104fd6fedc5fa6a7ed12d3eb680 SHA-1: 99454d7fa9abfc7db0969736653b51acd9ac2d88 SHA-256: e66669ba0d16d74d8dd5fa086c37192ef74b97ebcb0d7e76e73d095613f7fa76
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting it's used to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to exploit users via external links, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://ballarioarchitetti.eu/userfiles/files/lotulejoduzotuzibibo.pdf In PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/59527592830.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/denapifivofigepexeke.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210910_7F48A9D10FBFFDBD.pdfIn PDF document text
    • http://okna-kursk.ru/page_edit/_samples/userfiles/files/25018791774.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/juluvibobe.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409bc55895d---12758869702.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/9o3sp55e0e7hreqvq5afq9saf0/labelibaluj.pdfIn PDF document text
    • https://makenie.com/upload/files/41695930693.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/mirebixoroferozalifafiwe.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139b4ed927c9---16190800040.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/nutosenikisox.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/dovenitodavixovi.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/8896334159.pdfIn PDF document text
    • https://securitydm.com/slicice/file/59764133267.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/13138480382.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/notovepupoguw.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/rugukipotilo.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/nadulubod.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/xiratofudufimo.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/88545004259.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/33460784406.pdfIn PDF document text
    • http://silarperu.com/UserFiles/file/zosopobifaranopabuvotuz.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd6dde4eba---4581772321.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/texuru.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/loragabirinawadok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=some+apps+keep+crashing+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_off0000e185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE185 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF997 17704 bytes
SHA-256: b32b2f4904f554cb6361ccd59e833e33176c6c90626646f7818b568b2e6fb6de
font_02_sfnt_off000127d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D7 10984 bytes
SHA-256: 9bfacc1b60ab602332c5f41030df42c6559575dcc0b9ae51d416d0ce8320bc34