Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebbd7c67c338113d…

MALICIOUS

PDF

74.2 KB Created: 2021-09-18 15:24:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 893f013cb94f7b5c375f61f0cbbc325f SHA-1: 83532a2e4277b9dc8ea67cf91860ff2d9235a077 SHA-256: ebbd7c67c338113d99026ad263f397e70f88164d24156e651518fdb422f23e4b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, likely intended to redirect users to phishing sites or download further malware. The `wkhtmltopdf` authoring application suggests it may have been generated programmatically for this purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://crewmak.ru/uplcv?utm_term=how+to+delete+search+history+on+chrome+android PDF link annotation
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16139b363c07bf---pategabalirulawoposulu.pdfIn PDF document text
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/26794693196.pdfIn PDF document text
    • http://theloanwala.com/userfiles/file/7602422039.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/3271543165.pdfIn PDF document text
    • http://findingthegrey.com/userfiles/file/64100337346.pdfIn PDF document text
    • http://ilkemymm.com/image/files/67352232521.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/98305282750.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386a8a82b85---16526488869.pdfIn PDF document text
    • http://plantessentialoil.com/upload/files/jawozurewebedoba.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/bogupadiwososejagigelubip.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f874e4f0f9---18745342239.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/41rspon1ulakpimrooa2oj1mk3/kanerufepumeziwagomot.pdfIn PDF document text
    • http://domuran.pl/files/file/wikawonunefubeso.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/gisuzofevogok.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/lojikavumetududuxawotu.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/54063102906.pdfIn PDF document text
    • https://eccdc.org/application/webroot/userfiles/file/buxuwilitusibepesapi.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/50925388620.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16140c2a7d3068---rimamobudigunofajip.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a70b80bc71---zefovadeturamadofowevet.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/tezaxadafezebogolem.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131aac8cde77---12217064121.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/jeluzukomasowukop.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/mamakexinofuzumegoki.pdfIn PDF document text
    • http://soc-in.com/data/media/files/6599008096.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/82321521825.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/gapulotevatadidije.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/52094381206.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_off0000bfea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD801 10828 bytes
SHA-256: a725bcbf739091b129eda6adb17a873fdbc250c94eac9857a152f23886926add
font_02_sfnt_off0000f0ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CE 16164 bytes
SHA-256: 2ea9833412db04e586c36c39d4893b7bfd151348d5e30092a85db40b8f0e7482