Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dfef9cb116521fc…

MALICIOUS

PDF

100.9 KB Created: 2021-08-02 09:47:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: dc6a4b8afae7a5ae1df89ab635e773c1 SHA-1: f1c428e61dd0043eeb53fd68e289207877fd1d72 SHA-256: 7dfef9cb116521fc63184f734a22b47341509ae84e3d14d5a03a69bf4e6ac23a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://soechi.net/userfiles/file/jotelimajomuxavidino.pdf In PDF document text
    • http://smepil.com/ckeditor/userfiles/files/batexokinexewenago.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/fewasoguz.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/zujazi.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/fd54d82181b27a756dac7f53ee2d3e8e/66800142538.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/bimunel.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec62431a3a---nowakogajofuxejujunafike.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/12150030285.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/13768572327.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16071931f3ef28---12564281121.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/fewajikozafifunewixez.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/2f8058758266d5bac9af33eb3ec9ab3c/63952402392.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/re796vk6u0coqgc7mlr640fn7e/50090732086.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b87aa0f046efda5c896af9629785bac3/pipexumavobodek.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b46dea8d4bb---faxipomofukamisamusatut.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/gokusemuso.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607844bf2db0b---1761210279.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/11417307745.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b645ac46af0---sanizenaponevimetikinex.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609de622bcc4f---vadaremesukenemomej.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/9246986050.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=mastering+apache+cassandra+3.x+-+third+edition+pdf+downloadPDF link annotation
    • https://mediaget.com/userfiles/files/lufaviposezosarug.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_off00011f27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F27 11352 bytes
SHA-256: 80ee0f09152f0088588244c35058d86beac65085ec7d2d857ad71c686ae04f3b
font_01_sfnt_off000139c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139C3 18792 bytes
SHA-256: 80123cacaa81a4cdbcc249c571fa71163925d5796e06f9e378dfea8423545203
font_02_sfnt_off00016a1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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