Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ded1d3e1d6950ec…

MALICIOUS

PDF

83.8 KB Created: 2021-09-12 15:33:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c271259751f29cab0e1937746d624e10 SHA-1: e3aafd11de894576f1a8d02798c7a3a7c7906b34 SHA-256: 1ded1d3e1d6950ec313666879434d1e0713f2f5d8120d604b85bc237dcb9ccc2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://vitanov.rs/files/53433754293.pdf In PDF document text
    • http://scvumaichiramen.com/uploads/files/61375676220.pdfIn PDF document text
    • https://tenutaedone.com/filesUploads/file/47285656594.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/2640072702.pdfIn PDF document text
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/garuruwemupefopovek.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/81016231851.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16131b304a469c---jinok.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1613546342db5f---21033792085.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161362584d59ef---lijefar.pdfIn PDF document text
    • https://natinsel.com/imagenes/file/levujafilo.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd27d60d55---zediforadofekivunalomafi.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/35013000863.pdfIn PDF document text
    • https://forssh.com/userfiles/file/tawuxexegikisovafene.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/8803753986.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/5576013982.pdfIn PDF document text
    • http://bangdientunhk.com/upload/files/96703870532.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/55be64f97291a5282f6e634ed5139080/86118408302.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/6a55fcadfa335b177a18241b368bcb83/69940120558.pdfIn PDF document text
    • https://eventaipei.com/upload/files/miponexupan.pdfIn PDF document text
    • https://terrebleue.org/userfiles/file/wimiledupukojemifukib.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/64586491322.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/nipuboka.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/vapobawizidafafewuzefake.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/supigo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=thumbnails+not+showing+androidPDF 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_off0000dfea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEA 10852 bytes
SHA-256: 24738e702c7fe1c3adabbf9ab292bc3749ec78ec5c8bec92e9d0c7a6d7bd1791
font_01_sfnt_off0000f895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF895 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A7 18836 bytes
SHA-256: b49fdf2e20239fc2a3331da3a6eebba6d95e103c3d83a7ba7961bfc559cabd54