Malicious PDF — malware analysis report

Static analysis result for SHA-256 75bbf6a7b25d6e3b…

MALICIOUS

PDF

120.1 KB Created: 2021-07-02 16:55:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7f62da662bc7323fdcab9584d85cd954 SHA-1: 4282805289c5bf47281267ef3f8da57e1afe5c7b SHA-256: 75bbf6a7b25d6e3b7b53ae088e6992d2d479481a475745dd5cb2b23936fafd0d
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous embedded URLs were found, many pointing to compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The PDF's structure and the nature of the URLs strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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://ost-fogging.com/upload/files/51313520797.pdf In PDF document text
    • https://ludifrance.fr/userfiles/file/30261552125.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc7cf4dbd1---kefagebilizum.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609090c48e8e6---kimolumefigikumelikotuz.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bef8052fd2a---levakawudasiros.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/8c5e65ec6d5170d14f072bc30c79a9fe/54598856497.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/siwusiledaluk.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d1a2dddf8---mawerepadape.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/c36fa63bf1582cd18ded8de4ff89fb58/letubuwuditob.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/wekozizonabat.pdfIn PDF document text
    • https://vieclamkythuat123.com/upload/files/birok.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/p88g0cigu1vuig6qk2bovnv1o5/68998229449.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160967597366a2---19835773634.pdfIn PDF document text
    • http://www.toptehnik.si/images/80327310809.pdfIn PDF document text
    • https://activepymes.com/pub/file/zokosexix.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/guwewobajege.pdfIn PDF document text
    • http://unsersohn.ch/images/file/96836746937.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/d3aebeeec84dafeae2b5b871e3da427a/37588837618.pdfIn PDF document text
    • http://vietthanhstone.com/images/news/file/85652835258.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/59903906764.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/29649603558.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/47106749209.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/fukajemekuk.pdfIn PDF document text
    • http://thedreams.cz/files/7897479100.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/kiramijefebajaxosegudub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=another+word+for+nice+beginning+with+nPDF 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_off000175f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175F6 10588 bytes
SHA-256: 4c5a9610a379bf2c72c1b83d517f553ff032eebf6c96f581317ab9503e96efaf
font_01_sfnt_off00018de8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18DE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a5fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A5FA 17316 bytes
SHA-256: 0178ec7bc7526c72135da1bbc0f00e426b6da7f149cbf93d315787e25d23b837

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