Malicious PDF — malware analysis report

Static analysis result for SHA-256 2142128fdef7cf8e…

MALICIOUS

PDF

84.1 KB Created: 2021-09-12 15:11:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ec1afa7c82b1be78f2373f43ad6a1039 SHA-1: b70ef3a78ff81fdc2be038076a4da71f16f2f553 SHA-256: 2142128fdef7cf8e5898f263f4d22545f80e67afd705fa4bf487be126dccf8cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, with many pointing to potentially compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cructi.ru/uplcv?utm_term=1337x+torrent+proxy+unblock PDF link annotation
    • https://pielinks.com/UserFiles/file/gagufakewi.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/sajedijeba.pdfIn PDF document text
    • http://h04ydivan.ru/userfiles/file/zujovufizuxuw.pdfIn PDF document text
    • http://katela.net/userData/board/file/kawebatosikowe.pdfIn PDF document text
    • http://www.forteks.com.br/admin/ckeditor/ckfinder/userfiles/Images/xutos.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/26894981411.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///tadirukiduti.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/jisekazesexebozo.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3bb9d2559---41086179473.pdfIn PDF document text
    • http://gu-bo.cn/uploads/files/65040338639.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210908051024_me3its.pdfIn PDF document text
    • https://granitabrasive.com/editor_up/kebulunu.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/jepojuvijekofa.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021090123011678.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/14721199327.pdfIn PDF document text
    • https://alpinashop.rudy-ra.com/files/86309274840.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f178e81855---kavimepa.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/70993448995.pdfIn PDF document text
    • http://webs123.com/userfiles/file/99902069064.pdfIn PDF document text
    • https://magerp.org/upload/files/mulejeduxoxavoviz.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/f4ff5243f20608f95df96b93c3fa35d7/77332418601.pdfIn PDF document text
    • http://esistore.de/userfiles/file/bobevibojedulidetotata.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/24247975020.pdfIn PDF document text
    • https://rippa.pt/files/file/kitazinutu.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_off0000e2d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D8 10672 bytes
SHA-256: cc2da19d42433106368fbb2c418869c147f1471164f63435630602fcc4b354cc
font_01_sfnt_off0000fb58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001136a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136A 18208 bytes
SHA-256: 76db36391879df6480453ba7fadb0be453a6864deb741e1c6f92600f4ed12809