Malicious PDF — malware analysis report

Static analysis result for SHA-256 90d2a9061a3df1ea…

MALICIOUS

PDF

82.7 KB Created: 2021-09-10 05:16:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 45d1ce5f0828ebbeee3ad691a9629e7d SHA-1: 40153ef78347b70a8b6d281a81c4fb8e443a24f8 SHA-256: 90d2a9061a3df1ea413de27f615cc8375ed80315658868d0c91549b21a1d7f65
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://queure.ru/uplcv?utm_term=office+365+smtp+relay+configuration PDF link annotation
    • https://toscanafantastica.com/userfiles/file/53928265293.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/jonawav.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/56093111919.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/99957138036.pdfIn PDF document text
    • http://zimmerei-possert.at/16959127491.pdfIn PDF document text
    • https://imagebrandstudio.com/userfiles/file/3294855354.pdfIn PDF document text
    • http://automyjka.pl/automyjka.pl/userfiles/file/48305948811.pdfIn PDF document text
    • http://deforma.it/userfiles/files/weparasi.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/42887062669.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161391bda6a597---fapadubosaru.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021090921003389.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/ronuvulerurali.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/57518522388.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130147324b07---wudofukodanulaful.pdfIn PDF document text
    • https://www.sophrologue-nimes.fr/upload/news/files/kimolesoboraximelope.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/wozetuluvaki.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/pomebenufilejobuwitot.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613396bab1311---29418766648.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/sidimovuve.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/ee01590f85fdb0f346718a76137f3633/79888597987.pdfIn PDF document text
    • http://tuivaivietnam.com/uploads/files/rutotekitavebujigize.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/mevinapefegatanisogupusu.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/jaguwuk.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42627209182.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/62321357438.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_off0000dbf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF5 11536 bytes
SHA-256: e1c6ac32a95c8d68dcf9522c1dda50fa9b8f4201c63cc93f884e096ec593238a
font_01_sfnt_off0000f768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF768 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7A 17600 bytes
SHA-256: 190636a516177e67d985379433ef006bd8cab64cb7e74d10057a3259c513f6ba

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