Malicious PDF — malware analysis report

Static analysis result for SHA-256 48e838b83e1e9b33…

MALICIOUS

PDF

80.2 KB Created: 2021-09-18 20:04:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b4c1ce3c8791255095bdff1e545acbe5 SHA-1: 4a241c88bb099dc3fb6be9aab0b5250332e38240 SHA-256: 48e838b83e1e9b33d248ebb26afd911b5bc11ad9802db7ff5e8a4ca23cda63b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many hosted on disposable domains or compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://blankheich.de/images/uploads/file/lawutojelavif.pdf In PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143c07ce0840---puxigozakunorafora.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a9fc12031---34602645741.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/74386364763.pdfIn PDF document text
    • http://alles-vom-schreiner.de/userfiles/file/17237895037.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddfa5587d0---mexukudo.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0572dc7a7---buwonufebepusesawapo.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130faa523866---waxerixogaral.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/48808344175.pdfIn PDF document text
    • https://kligi.viart.lt/ckfinder/userfiles/files/pokobokazagovu.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/fiwugewepefusemuliguneja.pdfIn PDF document text
    • http://clubselectionvoyages.net/images/file/45395833076.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/fiwurufusipar.pdfIn PDF document text
    • http://peoplefoster.com/pliki/jamixovivuwitasuwanor.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/17785350975.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/55662378638.pdfIn PDF document text
    • https://1snrpaulista.com.br/ckfinder/userfiles/files/76799589944.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/fudofarodezid.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/95177976541.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/biwaf.pdfIn PDF document text
    • http://hwayoung.kr/upfile/files/lejawozumosabigijofubo.pdfIn PDF document text
    • http://dsraxys.com/uploads/81614116960.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16141b9f3af65b---tepivuva.pdfIn PDF document text
    • http://qigong.ru/userfiles/file/muzakexadasaletupipor.pdfIn PDF document text
    • http://synhbio.com/upload/files/sesesaluzevuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=meme+maker+apkPDF 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_off0000d3e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E9 19216 bytes
SHA-256: 8a0a38e011f272f6e1d0a8919af16a071760040e147dba70b7bba31f444526ee
font_01_sfnt_off000105d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DEA 9868 bytes
SHA-256: 92263865a366cbb9c4c693ce4bbb3e8dad386d4932bc4aa1d344ae7418720a4d