Malicious PDF — malware analysis report

Static analysis result for SHA-256 9303cb1bddad3569…

MALICIOUS

PDF

72.2 KB Created: 2021-09-15 13:57:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 467ff9de41990b2f186803ecc231bc23 SHA-1: 3660e6848c087f43f7a0ee31a75b0dc1ec56c600 SHA-256: 9303cb1bddad356972ba0ad2680acb046b91cbfc848633151a861fca9a52bcfd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, many of which are part of a link farm designed to redirect users. The primary URL suggests a lure for downloading an Android application. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://wastran.ru/uplcv?utm_term=hogatoga+app+download+for+android PDF link annotation
    • https://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/wizojax.pdfIn PDF document text
    • http://tatnhapkhau.com/ckfinder/userfiles/files/50788228079.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/161370e7eeb74c---21315403823.pdfIn PDF document text
    • http://labotinnghia.com/img/files/fagapulobefopupowubozalu.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/giluganakewonofowefopa.pdfIn PDF document text
    • https://projekt-lesen.de/userfiles/file/35173999129.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/dasujinifegavalanal.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/280914093.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/lubitom.pdfIn PDF document text
    • http://ficfart.org/userfiles/file/zifeza.pdfIn PDF document text
    • http://interroadholland.nl/userfiles/file/kovebidedom.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/susodulo.pdfIn PDF document text
    • http://cnsgafgl.netsociality.com/upload/files/6152086147.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137170213297---80396312859.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/161397adced48b---19865400466.pdfIn PDF document text
    • http://yuli-china.ru/d/files/jinemabutujowave.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios/files/senikivadenekenan.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/a6mkpuae5476itqgook587hpo7/41774550540.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/161404ad609c95---14919949913.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/tigiligesifos.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/vemagosituvem.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/gibuzidigog.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_off0000b92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB92D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d13f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD13F 16680 bytes
SHA-256: d06e79b614a6710f9d8d31f8488fdf3f0c73e15c21abc88cfa078449e1139595
font_02_sfnt_off0000fb6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6F 10448 bytes
SHA-256: 3af1b4cc50ae9e8fd2e875fb146f45b10b171e25f94863f4cc7a798131377b60