Malicious PDF — malware analysis report

Static analysis result for SHA-256 98ff1f2be19a2227…

MALICIOUS

PDF

75.2 KB Created: 2021-09-18 15:09:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b3a7bf0c760b6de56e78d12df46f615b SHA-1: 7b047a98a5c4db1ddcfccd1c509921f543fc8a96 SHA-256: 98ff1f2be19a22273d74906247de47c96f37719a8bfbe500d989fba544f6016d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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=avengers+infinity+war+full+hd PDF link annotation
    • https://bi-kiesabbau.de/cmsimple/images/file/47408272932.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/wofupagukavemilose.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613027ba78208---nipitebebarojuri.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/q71hddlblru6s0ec4elj28sog7/55565592958.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/zevujixapawogodigoxeji.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/855914304.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/pabelomeruparifejiduw.pdfIn PDF document text
    • https://szabolcsipeter.com/userfiles/file/wudurigodozibaxatelataxof.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/72607950113.pdfIn PDF document text
    • http://enewind.com/pliki/file/liwixepiwawotuledekuwun.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/15280565429.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/fiwudotoxabilefiwuguger.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/64953687969.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/29901170011.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/91b9c90a3a6c39e661300d56a506dbae/63044711549.pdfIn PDF document text
    • https://petikdaun.com/contents/files/diwugiwapetapipuvenofet.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/82490024189.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/j8jcedh6oo7tfldi8eposb5ab7/39721828834.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/13654159355.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/jasabexegoxuvasega.pdfIn PDF document text
    • http://origo.ws/userfiles/file/majezowanidoserijat.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/13588698682.pdfIn PDF document text
    • http://devveb.net/userfiles/file/sebid.pdfIn PDF document text
    • http://rrarental.org/upload/file/moferunojegemivusosimom.pdfIn PDF document text
    • http://www.onlinenieuwsbriefversturen.nl/gebruikers/afbeeldingen/dufojojogodule.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_off0000c0c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DB 10860 bytes
SHA-256: 3bf7abc8eb0813e9146fa262da9512e56a3f803ed8d90898f8bfac3ce8ab89bd
font_02_sfnt_off0000f1c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C1 17516 bytes
SHA-256: 0423d8d40593e8b24492f655a4a769aca58768e09607e4b409de847b0977c72d

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