Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2e6c5951a122d6b…

MALICIOUS

PDF

85.3 KB Created: 2021-08-16 22:05:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 22e5bde73f8037bbe0e56cc31631977d SHA-1: 01bdc9f9773379a2c4e665c781c8da704841dcb9 SHA-256: e2e6c5951a122d6bfd330825bf72ebc32ec98e6efd67fc17b2a828804eb085be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous other PDF files hosted on various domains, some of which are identified as compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a lure to download and potentially execute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://cargotavio.ru/files/file/gebizovevopodogutelobegu.pdf In PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/42456395017.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/puwumitoxonadaniwofizenin.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/30593679992.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca6d267eb6---kujokupesus.pdfIn PDF document text
    • http://mosjob.ru/images/file/45822330014.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/60294255715.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/8ea8a034d82439606800a70e1f358d05/54992897505.pdfIn PDF document text
    • http://www.nbc.com.vn/ckfinder/userfiles/files/wofebupawetuwakijatode.pdfIn PDF document text
    • http://hizlipin.com/calisma2/files/uploads/xofagekurewalafuvapanik.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a59c9d25d39---guxesodaxajavogogaw.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/lunexosexitokadokibebut.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/bitalesawom.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/6c8d107744ff3416c925c66d21fc1943/luwijig.pdfIn PDF document text
    • https://jager-ig.tw/up_photo/file/63335871916.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/lozugamav.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/melodulepunaramidoguvuwir.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/pujete.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/55734b84c4bc94ef62754dab435bd89d/nogiregi.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/kuzejeli.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/e2d2519643124d15af86baab53982dcd/buburilak.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/roluralifawirafexo.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070b5a655567---84243287571.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/78304638112.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b833fa25eaf---71394234346.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/c4dd7e192b9f8abd46c4b679e960beec/jutolomefokapekigijatuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+play+jeopardy+rulesPDF 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_off0000eb79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10390 10612 bytes
SHA-256: 41763846f44afa404a9e6874ad82fbf8ce099bdd09f0aa003a258a788e3e520b
font_02_sfnt_off00011c0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0F 16732 bytes
SHA-256: 24941bff009bc6acc1d3baf8b752ee52dcb9c8a4378146ce9e483b6ab64916c5

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