Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bcf683e202eb9a8…

MALICIOUS

PDF

93.5 KB Created: 2021-09-19 09:22:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9fc48695dc18e68b7b36d0e2aafe1bcf SHA-1: 0332be4d942d66c71ec872e5471cae465523d8a2 SHA-256: 8bcf683e202eb9a89b45846fe267745977425ca7a7371c4b6e081d2e9dabe6ac
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or appear to be part of a link farm, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://pistant.ru/uplcv?utm_term=pixel+experience+redmi+4+prime PDF link annotation
    • https://fetogram.ir/images/upload/files/dinorikidajogokojunidoko.pdfIn PDF document text
    • https://corpus.bg/files/fck/file/46093052295.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/fadifulijezazekojaxo.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/58050166576.pdfIn PDF document text
    • http://phubozena.pl/userfiles/file/33763365590.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f70361e69e---1192159887.pdfIn PDF document text
    • https://ratodua.com/contents/files/81406727013.pdfIn PDF document text
    • https://coil.hk/upload/files/tofupinaraxoz.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/xuzorof.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/62799114617.pdfIn PDF document text
    • http://stisk.com/file/20000248475.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/pj5tjqke2ge3t6uqv5fbohlmk4/24839302660.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/78792403344.pdfIn PDF document text
    • http://xn--80aap0abfiql8h.xn--p1ai/admin/ckfinder/userfiles/files/58687966808.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/farurujuwodiwutadepelaxu.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/putiteru.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/wolatirimuvusefawoxip.pdfIn PDF document text
    • https://vientangluc.com/upload/files/lixupota.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/kenejobaxomaradowisiz.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161448a3c872d2---15829031580.pdfIn PDF document text
    • https://protum.se/file/31924350097.pdfIn PDF document text
    • http://jtipartner.com/ckfinder/userfiles/files/91470305683.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/49798933724.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/sezonavuvus.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_off00010821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10821 18892 bytes
SHA-256: 888c92a33535e33287a812a9a3cc35c073f679eba232c53ae2bdd0fad1f8b297
font_01_sfnt_off00013924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13924 10308 bytes
SHA-256: 6ac0d5c0bfe9c0c161e1fd99f907d8428c9794e581812cba2bdc56939a508036
font_02_sfnt_off00015055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15055 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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