Malicious PDF — malware analysis report

Static analysis result for SHA-256 8071bdaed50d23ad…

MALICIOUS

PDF

80.9 KB Created: 2021-09-10 15:32:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 97b10479b7ac9fc4e2c0ad6b1621296c SHA-1: a53fde7fc1d3b375002dd9082f695fdebf40dbf4 SHA-256: 8071bdaed50d23ad29cfe9f6328b9f651dea43c46d2a671122096e2613b37a35
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories or are hosted on disposable domains, indicating a link farm designed to lure users to malicious content. The document body is heavily obfuscated and appears to be metadata from wkhtmltopdf, providing no direct user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://cructi.ru/uplcv?utm_term=best+gps+apk PDF link annotation
    • http://vertracapital.com/uploads/files/63906876493.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/8d7fb80ecbd4ad5c6220b50d118984bc/lunoremafitifonimizulam.pdfIn PDF document text
    • https://valerart.com/ckfinder/userfiles/files/dekolatagaso.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/bidolekuludujomifila.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d11a5f21d---gijametenuk.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/wexufetimizebowumaz.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/63675573529.pdfIn PDF document text
    • https://stephan-kratt.de/data/reiterhof/userfiles/file/xivezubebi.pdfIn PDF document text
    • http://cross-winds.in/upload/contents/images/images/13668070825.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/35201446621.pdfIn PDF document text
    • http://starma.pl/files/file/51464283404.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/jisamepavok.pdfIn PDF document text
    • https://vespaclubcagliari.com/userfiles/file/ninokugilifafupabepotak.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/90343177764.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/7611521603.pdfIn PDF document text
    • http://islaminkiel.de/webmisr/uploadwebmisr/file/bonudomisitogatipeginas.pdfIn PDF document text
    • https://3rproject.eu/ckfinder/userfiles/files/webagerutir.pdfIn PDF document text
    • https://skopjemuzikon.pmgrecordings.com/ckfinder/userfiles/files/kaneguxupereweka.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/tuxemefamituruluwefobex.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/fodugefa.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-9-3/20210903125112211908.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/161302d7a6f0e7---81028754097.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/60015586500.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/60872191479.pdfIn PDF document text
    • https://777mto.org/contents/files/zorakazigixojaf.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_off0000d914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD914 10112 bytes
SHA-256: 44946c76c8b3fc8cf6498dd5a925aad74e49da6dcd787c7e2ebf49faf53a80b1
font_01_sfnt_off0000efdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDD 17924 bytes
SHA-256: ee0bfd81450f43137a5b8708950852b0d479d8121222864f8739a6bffc6d4b05
font_02_sfnt_off00011e3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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