Malicious PDF — malware analysis report

Static analysis result for SHA-256 2705847e3af51653…

MALICIOUS

PDF

76.2 KB Created: 2021-10-09 20:05:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 885eb680364000ce29e9703998082c8d SHA-1: c1c9a5034f92b7033f6dd3a410a496284ea793a8 SHA-256: 2705847e3af516535f5d41d584c64eda4255b87e22b00daa711dfd3d3cdd93c0
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting or compromised CMS upload directories, indicative of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. The document body is unreadable, but the heuristics and URLs clearly point to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://oniceh.ru/uplcv?utm_term=another+name+for+crimson PDF link annotation
    • http://kimbuunguyen.com/uploads/userfiles/file/30907795147.pdfIn PDF document text
    • https://designsdubaiukfashion.com/userfiles/file/doneg.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/fefabomirekosiraxafupefuf.pdfIn PDF document text
    • http://uchid.com/uploads/file/vasawazo.pdfIn PDF document text
    • https://parfumzone.ro/files/file/sipogufarew.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1615ad4aa53ee7---81035401887.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/e462e17c4aeac48f7a76671c7d24e1e8/bevapif.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/78190799107.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20211002034911.pdfIn PDF document text
    • https://oferta.lt/i/File/tusavibabad.pdfIn PDF document text
    • https://karjerastests.bankai.lv/ckfinder/userfiles/files/jujujujikiwupepotavat.pdfIn PDF document text
    • https://tessuno.com/upload/files/6156de02a0832.pdfIn PDF document text
    • http://www.puhito.hu/uploads/vepalonivaxe.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/lopunufemamojojirazumado.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/19784328784.pdfIn PDF document text
    • http://wonderpanel.com/app/webroot/img/file/bulepogulitepa.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/66338292535.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/momewitideku.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/demuzasalonik.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/9b7bb22410b22cb1718e3c0d4eb180a2.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/2021917221683570.pdfIn PDF document text
    • https://memo-log.com/userfiles/file/veteded.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/zubigex.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614474cf8e216---95550860618.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1615cc2bfa5474---3638504496.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/42648153180.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_off0000c20d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC20D 10536 bytes
SHA-256: 38ec9433fd3360669316a63224eeec7c808054789697f66cc3b9905e3d8d53f0
font_01_sfnt_off0000d9e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E9 18832 bytes
SHA-256: 23864c0ac4f17d8c0250d536f9686c22f9cb9be69663c217adb4ff577e964534
font_02_sfnt_off00010b21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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