Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed2ac29afa0d1428…

MALICIOUS

PDF

71.2 KB Created: 2021-09-23 08:18:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4c71a685d1ca217c6e8827905a4a2682 SHA-1: aa0583f93173b816c31e72fea012490df0e706ae SHA-256: ed2ac29afa0d142818d50b93935b69f21f554397d5026850eb8e6484cf3bb248
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various websites, some of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URI and link farm heuristics further supports this, suggesting the PDF's primary function is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://irlanc.ru/uplcv?utm_term=idm+video+downloader+apk PDF link annotation
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/cvjukmgsg0es3003d10d19c1b3/rolid.pdfIn PDF document text
    • http://rydelko.eu/userfiles/file/nojujivujapiwejuwuluwidin.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/xakuzamakosuzibika.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-23/20210923130525605342.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/22861392387.pdfIn PDF document text
    • http://zamaro.cz/images/fcke_files/file/mexugewaregovawupe.pdfIn PDF document text
    • http://unsersohn.ch/images/file/nomilupisaje.pdfIn PDF document text
    • https://airxps.com/userfiles/files/75857872052.pdfIn PDF document text
    • https://proartgaleria.hu/files/files/gibapetupaxota.pdfIn PDF document text
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/jajowo.pdfIn PDF document text
    • https://bulgariapools.com/contents/files/nopepilevezot.pdfIn PDF document text
    • https://pomtco.com/technical/files/file/ligulamaramobedivoperube.pdfIn PDF document text
    • http://risme.vn/files/58916243289.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147a65769a3d---68772699288.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/julonoxalanibe.pdfIn PDF document text
    • https://datajournonepal.org/files/rajabimixo.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/dedeg.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/puxonijobasosijavotoz.pdfIn PDF document text
    • https://china-glass-mosaic.vegner.com/userfiles/files/20210922_173849.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com/app/webroot/uploads/ckuploads/files/lonatejadogiwana.pdfIn PDF document text
    • https://manpowernepal.net/ckfinder/userfiles/files/10107519623.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/38955810155.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/7df8cd83047176d2d79e7fffcced106e/larotilolizoziluvarom.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_off0000b53c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB53C 16768 bytes
SHA-256: 9a4aedcb7500cac14976c9fa6f4f84afdda72a190049baade6c22577dfce3b7d
font_01_sfnt_off0000dfe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FB 10484 bytes
SHA-256: b06b347a79e46e870edf6ff03809d00b2312d5acfc1f8acb1aeed007df0bc5b6