Malicious PDF — malware analysis report

Static analysis result for SHA-256 385a2b45bb192657…

MALICIOUS

PDF

84.5 KB Created: 2021-07-09 20:06:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d9c452f6e7e720545144c6b666e8ce14 SHA-1: bd8a7539e65f70758d6332d688690fe97bf44bca SHA-256: 385a2b45bb192657ec3afae3af915012902517c8b66bfef94038f0c04deea93c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the URLs and the detection as a trojan indicate it likely serves as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://infrive.ru/uplcv?utm_term=range+of+piecewise+functions+calculator PDF link annotation
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4c2921346---lojomawikosebe.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/dfghihn2pso0qvprv6jkot5ai7/27419460275.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210704_107FB56257FC24AD.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/misesuso.pdfIn PDF document text
    • http://vetranhtuong.info/luutru/files/31091478473.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/29987611040.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf2005dbeb6---37460410386.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/wilobifafoxujatamu.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609cded4541cc---42845190537.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/5245823972.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/b93c9aabb5fcc0ed20932af9ecf604e0/gafebinevoke.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/bujokevazukasamo.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/pidutuminezasaxemolavunib.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdea4105c4---zazawu.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/b2h3rf41cm2kvka8b1eaojdmo1/40199066765.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/c898d55dae85d74e3ac87c14379b136d/pisigisujibotuzuk.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082951391a2d---bufatumijosekova.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e997ebc2a6---fireloxasowojovafapowuz.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/rekikikakelenoj.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/f31suhqjdstfjaiaf29t151i35/42019041323.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/masipabegunufawo.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/lotavizubanavubujuw.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/tokisogefijewodulawevusis.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ba8a23a12---babazeniko.pdfIn PDF document text
    • 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_off0000e814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE814 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10026 16448 bytes
SHA-256: 00ab9f3550ec415726c29e9e9fb4cf1ed7f0be66bd5460d3bd451cd2b1caada5
font_02_sfnt_off00012b0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B0D 10888 bytes
SHA-256: 3098a02bec46ca4f4401f841b3d961f73dbb12202c4063f408eba25b4689aedf

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