Malicious PDF — malware analysis report

Static analysis result for SHA-256 d92472c7ec97b12a…

MALICIOUS

PDF

70.6 KB Created: 2021-09-11 20:58:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e88d52c2b9ad8d14a64f4b4415493d8d SHA-1: 827b2ac8f2b30e05f23043b0227ae2546dc60b40 SHA-256: d92472c7ec97b12aaded8f9e945c907b556662b72597afa99be135c5a8947e06
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs point to various PDF files on different domains, suggesting an attempt to distribute malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://grandviewgroupresort.com/upload/files/nodumugiterenegidi.pdf In PDF document text
    • http://p-itos.net/admin/userfile/image/file/bodeduwuzorojowefazob.pdfIn PDF document text
    • https://airxps.com/userfiles/files/62481089240.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab8edcfdfa---lifipewig.pdfIn PDF document text
    • https://atavio.ru/files/file/rokedulirimenakanekar.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/33979781912.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/wilisolikefumari.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/toponekugor.pdfIn PDF document text
    • https://sgicorp.com/userfiles/files/99784626557.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/wikis.pdfIn PDF document text
    • http://aylabawadi.ae/userfiles/file/29281353865.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161377778042ff---sokijugazodezamus.pdfIn PDF document text
    • https://congchung7.com/upload/file/jekavumewutujanabi.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropadefutbolbarata/userfiles/file/22368622209.pdfIn PDF document text
    • https://vnmmalta.com/userfiles/file/23771586570.pdfIn PDF document text
    • http://ucokampen.com/media/files/66849933169.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/kafizomiverafubofuzazev.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613149a088c48---9666784953.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/sotupunifegopadot.pdfIn PDF document text
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/rerebigivupuxawesivumovi.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/tiwaxotatejofoxifaladixi.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/ae2f9b1a3333819f948a2a27268b6c4b/70648806024.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/lerisexumuzopegabajijas.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/subexenonogaka.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/2021911049154455.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=car+racing+offline+multiplayer+gamesPDF 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_off0000b3da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3DA 11068 bytes
SHA-256: ce99e1962005bab55ed914deecc1ed3226469e289cab1f0200289645e443c651
font_01_sfnt_off0000cdb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB4 15244 bytes
SHA-256: 6624b53b0ce6f7ae639480b4d74ef0c5a7e45e7820479ac181206fd8ba099259
font_02_sfnt_off0000f49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1