Malicious PDF — malware analysis report

Static analysis result for SHA-256 e711cd3a7274e4f3…

MALICIOUS

PDF

72.2 KB Created: 2021-09-04 15:00:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d25a1e601240c658b0f803542b676186 SHA-1: 24d228dd8acde4bfc79d1e448f0b874aad29b47a SHA-256: e711cd3a7274e4f38a8e303807a8501d417438ddce36d0a74aa8f492273cabcb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://fleschimmo.lu/userfiles/files/pasuwife.pdf In PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b39744a9c28---51181139455.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/47cc39e554abd86030b8ccac5991249d/8276782581.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/ee407s4ofh35677ercq0mjnla2/bejefuruvaseb.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/48303452775.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/57140190874.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/fe43784e0cb2d08e6e7da40472e3c085/kebufejatixili.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/b2a846f68dfb728e2ecf0cf19f7c6723/malumusazozexebivo.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name//files/85509271870.pdfIn PDF document text
    • https://umiyawoodworks.com/fckdb/userfiles/file/70559654511.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/79885742565.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd37433b34---12656051426.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/kezaritonekapes.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/48932631.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/lugemurevuri.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/26594573476.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/28747912020.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/70d1add5d5f38041146aabf6a04dffc0/19484869717.pdfIn PDF document text
    • https://akemi.ro/hirek/file/79665105284.pdfIn PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/60263501010.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6247a37d3---rozege.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/66280672294.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/0fae89fdbc216f38bb2dc0af30f06fcb/34553043413.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/datumugusoweluraxez.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1628494960.pdfIn PDF document text
    • https://abeess.com/userfiles/file/puzogudida.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=different+types+of+fire+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_off0000bd5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD5A 10400 bytes
SHA-256: d91ffe52daf5bd2acd0750e1d33d7b45c331560792ffad12619dedf00da2fdb2
font_01_sfnt_off0000d503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD503 15064 bytes
SHA-256: 700cfbb30db8a4549dd338024ccb20a03064fef2b66dd3d009e17e65bcd4b2d0
font_02_sfnt_off0000fad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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