Malicious PDF — malware analysis report

Static analysis result for SHA-256 01bf3ef2844d1ffe…

MALICIOUS

PDF

77.9 KB Created: 2021-09-18 21:31:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d83745c08216aad6a6bfaa6fa9d881c5 SHA-1: 414f6bb31bd31540a946176f5131a9c232af8832 SHA-256: 01bf3ef2844d1ffe6b23afe047bfbc4a426bd8ff036d54258d6ad71cb73f14a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with several pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/uplcv?utm_term=japanese+anime+games+ios PDF link annotation
    • http://ngnjl.com/userfiles/files/wegudotevakazijexol.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/65321433176.pdfIn PDF document text
    • http://snft.ro/media/file/21981338683.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/gofezitekakubumifosek.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/83446906489.pdfIn PDF document text
    • http://soundspace.eu/Upload/file/99564707828.pdfIn PDF document text
    • http://bayernglobal.de/userVZ/file/xulexinumijofuvuwe.pdfIn PDF document text
    • http://zhjpharm.com/upload/files/vujorefivujemugepu.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/melozomax.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/zelekimoxizejixutam.pdfIn PDF document text
    • http://budaors.varosom.hu/userfiles/files/19530391130.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/xavevateti.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/wikipalonebixobomugi.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614019456e519---11062057640.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/vopekoburidemumuvab.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/xozebukawaninim.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/67217315264.pdfIn PDF document text
    • https://renewone.de/files/40508651481.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/zubes.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/gavolonusewepivibev.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16143c595114f0---wegoxitopoji.pdfIn PDF document text
    • http://technimexvn.com/images/ckeditor/files/vukovopuwubi.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/borewivagerojijuterivuneg.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319c81712b6---71497903177.pdfIn PDF document text
    • https://energooptima.hu/upload/File/wavafuvebaxotaw.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/29901463490.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_off0000cf21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF21 10344 bytes
SHA-256: a5e06c7d4151e097d23ba5cfb068ad07f79476feca46175a8caf4c8d9516d645
font_01_sfnt_off0000e675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE675 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE87 16968 bytes
SHA-256: 7f9b1f37e7a51e684fc40212cc14a0146249a5375358ad6398c754c003ef7aca

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