Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa6448619b4c5bc6…

MALICIOUS

PDF

93.9 KB Created: 2021-09-05 16:17:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 02d6ca501261e23528108439f93df3e0 SHA-1: 8fb17a6d14cb04e6102b32289c6b8990bc325353 SHA-256: aa6448619b4c5bc60e011914f542f3c07efbba70dd42d8f5d79636c32a0f5fd0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself is designed to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://sanaspinler.com/calisma2/files/uploads/deworugotefifu.pdf In PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9bd3bca03---lebutugudivipabasugo.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ah3cej9bug606abskmmfgv5qc1/93778297326.pdfIn PDF document text
    • https://viscom.bg/uploads/wysiwyg/files/24573132797.pdfIn PDF document text
    • https://protrialse.eu/files/files/84150561439.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/79696518104.pdfIn PDF document text
    • http://armanetti.com/images/3386937782.pdfIn PDF document text
    • http://recit-de-vie.fr/userfiles/file/90475626308.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/warelazu.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/vojamitiredixokidarev.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a08cfaeac6b---jerivusanozin.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/80635986653.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/gidibukuvetovubakivoka.pdfIn PDF document text
    • http://soflocops.com/clients/67403/File/39120702452.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/beraxibirabonolu.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/12190859880.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210717174929.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16084b2f97b91a---25880422919.pdfIn PDF document text
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/resujavekilax.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210822072352.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/gopowedevexobu.pdfIn PDF document text
    • http://menloathertonhigh1980.com/clients/6/6f/6f83464fe0b13873896cace574d4baa5/File/97702846396.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/valuxixova.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/dirur.pdfIn PDF document text
    • http://ceroki.com/image/files/71428347424.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/9d7508143269fc0e11aa6dd580fd4ccb/92655902706.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=escabiosis+dermatologia+pdfPDF 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_off000108be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BE 10984 bytes
SHA-256: 5084f61b49cb8a90126654c9a97e391a4a866e66edb4cae4ecf94f3557da0dfa
font_01_sfnt_off000121da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DA 18572 bytes
SHA-256: c6f5d4978f3fb1eec9623fa783e504a77b71ea9da80c33f190684b542891c0fe
font_02_sfnt_off0001519d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1519D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1