Malicious PDF — malware analysis report

Static analysis result for SHA-256 332cd82078b41cc2…

MALICIOUS

PDF

86.2 KB Created: 2021-10-05 11:49:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 54d95332459ed99c501e57ce4d6bca6c SHA-1: e558f74b311936162f23b5b4813828d193906f46 SHA-256: 332cd82078b41cc2e393dd6819d98d0fd1b563398d362e8452db3d39a3a2c9d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised CMS uploads, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous URLs point towards a common phishing or redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://infrive.ru/uplcv?utm_term=law+of+succession+notes+pdf PDF link annotation
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/fowemapulakiwok.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/4158811627.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4a4e4e2fd---41276037843.pdfIn PDF document text
    • http://xn--c1ajalgzu0a.xn--p1ai/userfiles/file/sujojezolozomenumaxege.pdfIn PDF document text
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/wiwumijomawilizu.pdfIn PDF document text
    • https://detectagsafety.com/ckfinder/userfiles/files/tajajomagukipi.pdfIn PDF document text
    • http://globalsublimation.net/uploadfile/files/xobezulamulawabaj.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613e33996c1e9---ragovebiper.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/nuxas.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/73687147072.pdfIn PDF document text
    • http://www.veslovani-vsb.cz/soubory/file/zegirufaxavojulijejonen.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/87288548015.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/rozajizivupewe.pdfIn PDF document text
    • http://mascotdd.com/file_media/file_image/file/tafuluvum.pdfIn PDF document text
    • http://websteravelandscaping.com/editorData/file/vegidinub.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/sikibavaditokojexipoxa.pdfIn PDF document text
    • http://hasicimosnov.cz/foto/Image/file/tabibizevizelerawugozigeb.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/16117075190.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1615b197a4461b---setefalozekotetaj.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/36828536764.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/76176988579.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/nigovelizisomep.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_off0000e9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DD 18600 bytes
SHA-256: ae7a014d011bbf887439eb190b38734e42df20b5822ba80c28cf1de754bedcf8
font_01_sfnt_off00011b38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B38 10612 bytes
SHA-256: e58a7e0465dd57169c32b10cd52fe749e503d8df6f5cb5cb3b93e80abd7a27bb
font_02_sfnt_off000133b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1