Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5a8069f9e1832a0…

MALICIOUS

PDF

69.5 KB Created: 2021-10-02 11:45:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 120de70fcbed9be9a27c50f4a2c9a339 SHA-1: e07c7ac77ee8d57b24d8e8a956466f3d7146b968 SHA-256: e5a8069f9e1832a0d01ee40094a1052b9ed694c94fc7bb0505e672a57c4c8c1e
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external files, many hosted on domains flagged as link farms or potentially compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The embedded links suggest an attempt to lure users to malicious content or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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 http://supermarketdv.ru/files/file/wurukubetutexewap.pdf In PDF document text
    • http://www.mousumibanerjee.com/fckimages/file/lerevurokaxuruginavobavov.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/wafitu.pdfIn PDF document text
    • https://edex.co/userfiles/files/vadosekelidasuraxutoruji.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/kupevutazikipepe.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/6351473334.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/22787262966.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/eed27d3df2c1e7ff9463f3029146dd1a/81231743246.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/belezalisedozawodujuloz.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/guzukanizuzaf.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/gesuwebopoxudefo.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/77424032551.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/xokoxepagawi.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c3a925121---juloraral.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/52172478057.pdfIn PDF document text
    • http://mdtrend.hu/files/file/jokadepimejap.pdfIn PDF document text
    • https://uudanbury.life/files/file/sevasinuxomovejepexate.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/161566829af9e8---jelijufusid.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///fonukonirekegefufe.pdfIn PDF document text
    • https://hse.tw/upload/file/4239007494.pdfIn PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/1576656337.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133844c1d66e---32778027264.pdfIn PDF document text
    • http://ashleymongolia.mn/uploads/files/493887290.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/papetisoduka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=harivarasanam+song+by+yesudas+mp3+downloadPDF link annotation
    • 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_off0000afb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFB0 14816 bytes
SHA-256: 292b362cc06fc77843441ce6c2a4a508b6d3f1764fef22e66f4d8850a02a10f1
font_01_sfnt_off0000d49b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ecb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB2 11304 bytes
SHA-256: 589cdf6b0441eba0e0c07a62e2151caa016ce5f8660542c7a279d73f99651c64