Malicious PDF — malware analysis report

Static analysis result for SHA-256 f03f4cf997604acb…

MALICIOUS

PDF

74.5 KB Created: 2021-09-04 19:13:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b85c83196ce2db26c627c768255acec5 SHA-1: fbbc554e4c96c42e4511446cb49281384d5d93b9 SHA-256: f03f4cf997604acb939938a9f628292a670d1de080d5a2c8e35134c41baa2a55
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites utilizing formcraft or super-forms plugins for file uploads. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary purpose seems to be redirecting users to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/161219bbe65a55---palavumewisolozafigukexab.pdf In PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/k2tktuobncg280hekkrd3m5coq/63514733774.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a04562691---vijenujovop.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16128b0d5ce48d---45499463239.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/wujaxad.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/gutikunom.pdfIn PDF document text
    • http://www.klimavill.com/data/editorfile/zotebaresaliluvuj.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161242d7918cda---kunelubomalanivedimivete.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/wikenesek.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/mekilesuzavupinisolizaze.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/liwafezuxerefurejagaw.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/lugusiza.pdfIn PDF document text
    • http://boxethai38.comupload/file/90276772398.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/3d10d4a1c12f22ca1bca1634ef94a5dd/47168227416.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/a4ada4812e242dec58048090f1c7d931/nijid.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/nozusaseva.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160de60c587c97---18075099183.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/37131875602.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609013c91a7a0---gupazawimap.pdfIn PDF document text
    • http://centrons.com/uploaded/file/175818095760cc788e0c341.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/65595069170.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/xevabivevoxirokid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=ebara+submersible+sewage+pump+catalogue+pdfPDF 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_off0000bd51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD51 11168 bytes
SHA-256: f24ff2cb6b0c1603e3d2478610451664d14659ed2cae67c6084f80a2b4bd75a5
font_01_sfnt_off0000d720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD720 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF32 17300 bytes
SHA-256: 5c4e4437dc5be7b3ac3c72dc2a676aae28de8b4cb681f1a971ef15995a0837bc

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