Malicious PDF — malware analysis report

Static analysis result for SHA-256 31be854dc482d4e7…

MALICIOUS

PDF

82.9 KB Created: 2021-08-23 09:31:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: c7ae9587c9e0768520970fb34d955ae4 SHA-1: 53c442c5086098406a5a9c63081ff04386443fcb SHA-256: 31be854dc482d4e72fc3c08c5e640b787b88434f16bac57922bd467c4cfcf6ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which are associated with link farms and compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. Although no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pixomot.ru/uplcv?utm_term=biggest+problems+in+the+world+2021 PDF link annotation
    • http://immodraft.de/images/architekten_agentur_images_/file/81592504264.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/28737639259.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/navufumefimapevejivotid.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/24183850145.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7bcb40e78---fiwoviwajafiwo.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/gafakipodufobute.pdfIn PDF document text
    • https://vinamex.info/uploads/news_file/rurobuf.pdfIn PDF document text
    • http://jar-ted.pl/file/bitiwobikenazerowavapu.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c06dca824f---miwevujuniwifevodokinivo.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/dapevavilunarasesazibem.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/77428372055.pdfIn PDF document text
    • http://latexindia.com/userfiles/file/padoxefofikulido.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/25400a3fe83c8d3c3199da42931a17fd/dinarapajiredo.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f042806a61---tafubopazodudi.pdfIn PDF document text
    • https://airshow-bg.com/file/vabegodumuz.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/71739067721.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/5b9999a4bd1f214eaca8f448b9bb718f/butuvukulojunat.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160989c6b788cc---nibogatokekekonedivobuwif.pdfIn PDF document text
    • https://unitjaya.com/contents//files/mokidopasubetu.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/vuppu98mf4aoua8n0do7a9bpi5/18162386467.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/77750957118.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/aua63v7g5e6k91ajdj2es84unq/58431826725.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/12032793862.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD24 17536 bytes
SHA-256: 755e43778b249f145f47437d0c53c52dd1bb667264d85c90a87a872735daff24
font_01_sfnt_off00010a5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12272 11248 bytes
SHA-256: 0a66b606d3d02d9a852c29ca87b0626a8ae81e69820ee786bf78b5bc043cb8ee

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