Malicious PDF — malware analysis report

Static analysis result for SHA-256 19a510154647d7c9…

MALICIOUS

PDF

84.5 KB Created: 2021-09-17 11:48:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ee0970519f5e95f2d9edfcd75ab4946f SHA-1: be40ce01a4239f5953154de8dd7b11750eb699db SHA-256: 19a510154647d7c9041252eed30896a7a39c25d80fb39781d6b8be98b9b4b0af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to compromised websites and disposable hosting, characteristic of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

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://synerhu.ru/uplcv?utm_term=i+have+you+have+he+she+it+has PDF link annotation
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/370257af200ee6401e1048e81d6ea198/54288195182.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/kopafuzokusilenopenep.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/22611172852.pdfIn PDF document text
    • http://abworder.com/uploads/files/12955066643.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/12937259622.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/9287542419.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614099cbe3f15---zubilowozovufis.pdfIn PDF document text
    • https://www.vconsole.com/ckfinder/files/rawegimuvabipini.pdfIn PDF document text
    • http://rebeccaosborne.com/uploads/9482130453.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/m2acgt6fqpp5ctb2hl789hmheo/10470799120.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613862df8721c---zitasidi.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16136102f24d8a---mujoluba.pdfIn PDF document text
    • http://chukguwang.com/files/fckeditor/file/tarojon.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/sigoviwuregisu.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/99086961952.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/35566904043.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/xibadazomovelifalevab.pdfIn PDF document text
    • https://cupanghitam.com/contents/files/rexobuvetovokorepi.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/65790751681.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/bodupexukelopaxoba.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/kirifubu.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/29865127786.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/gorafofotigita.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_off0000df16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF16 20772 bytes
SHA-256: 7b582eda3829278eaa6f90dffd6bf5d221c0a35d6222f5424d9d9b6f130ce2bf
font_01_sfnt_off00011510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11510 10184 bytes
SHA-256: 822028cf56b6c5671e73d8e166325e9c7caa9246c91dc07917e9ca424017bff8
font_02_sfnt_off00012c19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1