Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce1d526eeef61217…

MALICIOUS

PDF

69.5 KB Created: 2021-09-17 09:32:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 50052558824db5323d454ee39861e66b SHA-1: 417aad6d49d570d041e7dbbaa86e760df27f3d27 SHA-256: ce1d526eeef61217900e98efc14acd621a7bcc25a9d8f4a48f2c62e7bdede229
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress upload directories or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is structured as a link farm, likely to deceive search engines and users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=kp+thakur+english+grammar+book+solution+pdf+download PDF link annotation
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613474e270f3e---bexafeme.pdfIn PDF document text
    • http://pro-group.ru/userfiles/file/bemamogowosul.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210911061108.pdfIn PDF document text
    • http://ekmeta.lt/failai/file/wuwuvadulurumotumed.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/20493513897.pdfIn PDF document text
    • http://firesecurity.sk/userfiles/file/lakesunusew.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/63310316134.pdfIn PDF document text
    • https://myclubowners.travelenvogue.com/userfiles/files/64057150709.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/39484109831.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/84030311042.pdfIn PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/29255502118.pdfIn PDF document text
    • https://lanjutpt1.com/contents/files/lowobemurisorikedoji.pdfIn PDF document text
    • https://doan295doson.vn/namthuan/images/news/files/89196266169.pdfIn PDF document text
    • https://krainaogrodow.eu/zdjecia/fck/file/mexomaf.pdfIn PDF document text
    • http://hakanhurdacilik.com/userfiles/file/71727770903.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/f6d2ea70a2446a9d793fcadf80613c24/povimiretijevibetubodex.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/52938479898.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/takeduxabativutubogal.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/99199645852.pdfIn PDF document text
    • http://kelvista.lt/images/files/50501995458.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b04ec21e8f---lowuxaxaderimegidajamato.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/64985109333.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_off0000b290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB290 11356 bytes
SHA-256: e57ea6d4629848d399bebee7cda7e8be563a27cfb04934cfc32178dd97a06692
font_01_sfnt_off0000ccc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC0 14168 bytes
SHA-256: 0ed9642709c20b40d4871f4b9771d00e57b31936037aed89961465d495ec3789
font_02_sfnt_off0000eff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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