Malicious PDF — malware analysis report

Static analysis result for SHA-256 db457dc787ba0d31…

MALICIOUS

PDF

96.8 KB Created: 2021-09-23 01:02:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 52f4a1bbf6a980c0effd30355721f191 SHA-1: 3af422eb2609fe18cce5b55e3b356beb19028e98 SHA-256: db457dc787ba0d317e2835a8f23051b39d9026a40150512d424bdbe10ffc50e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://zenithmetals.com/files/70668129912.pdf In PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c2d0691ed---32705513557.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/vakazuwesivonedup.pdfIn PDF document text
    • http://napiarsaigh.com/images/1873914294.pdfIn PDF document text
    • http://1472bond.com/upload/Fckeditor/file/24936103201.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/69201847124.pdfIn PDF document text
    • http://namngonviet.com/user-/files/21135892023.pdfIn PDF document text
    • https://shturnev.com/files/foFKED/file/97630653815.pdfIn PDF document text
    • http://seamacros.com/upload/file/77563791105.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161469f29dd658---xujalevafugegafibexebaru.pdfIn PDF document text
    • http://hexindechem.com/upload/files/jibal.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/32540972299.pdfIn PDF document text
    • https://ribaczpeter.hu/files/file/25843051539.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-9/20210909091606137197.pdfIn PDF document text
    • http://ageofwonders.buka.ru/sadm_files/74498017580.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/bonobebabigategukonuzalo.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613fedbc27662---sazodolo.pdfIn PDF document text
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/84041031585.pdfIn PDF document text
    • http://ipublicity.cz/data/file/42380061436.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/xezadumomexatalujaf.pdfIn PDF document text
    • https://kaptenhoki.com/contents/files/taxijuladafigabasigap.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/60563172345.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=telecharger+jeux+pour+tablette+androidPDF link annotation
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/toretaxufum.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_off00010f6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6E 11060 bytes
SHA-256: bf720bc56b03a40a9182b5c91d772a7e4fd55a2d4bd645aa0343bc63c32172a6
font_01_sfnt_off000128b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B3 20768 bytes
SHA-256: 56d95908fcc02183860c5415347b110b3215b25c2c6aa12770f21a1cf7753e31
font_02_sfnt_off00015dbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1