Malicious PDF — malware analysis report

Static analysis result for SHA-256 989ed223498c2e78…

MALICIOUS

PDF

80.9 KB Created: 2021-09-16 18:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0c0cf2885bfc53dac308cc36cd62a1e6 SHA-1: bf00085e4aaf2aded0e0e66f4622f4da023c0288 SHA-256: 989ed223498c2e7858a9b12e094267fbcc57aabc8d2674b918b285a441052ba3
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with multiple URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, such as 'https://oniceh.ru/uplcv?utm_term=run+windows+games+on+android', are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://oniceh.ru/uplcv?utm_term=run+windows+games+on+android PDF link annotation
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/69293814705.pdfIn PDF document text
    • https://hoangphatdanang.xetnghiemadndanang.com/uploads/image/files/kikutiwitanav.pdfIn PDF document text
    • https://ozora.schaffsen.com/contents/file/20156964963.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/55359251615.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140cd5b2f754---2883197903.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/xubiluwoxuvigonamofi.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138ddf0aaaab---pobigekunupofipe.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b48705d699---pudaze.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/taturar.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/15489603094.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/gajiwawenilimaxuto.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/pidizifunefiwe.pdfIn PDF document text
    • http://gardens-spa.com/user_pict/file/wejumaja.pdfIn PDF document text
    • http://qdxqw.com/uploadfile/file/12484791252.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/xajusupuregerumotufakade.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/xemalalaxewon.pdfIn PDF document text
    • http://www.startbatteries.gr/ckeditor/ckfinder/userfiles/files/36366561159.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/xafitufot.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/gedasemimot.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dee7a5c637---56851195219.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/tazepitusire.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/48501708213.pdfIn PDF document text
    • http://hantechwelding.com/userfiles/file/2021090720064173499.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/42038426017.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_off0000d718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD718 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2A 18116 bytes
SHA-256: 0007c787d11381160514d61b79b161e0ec7e0c378a1ede92ab400755d75b6ddb
font_02_sfnt_off00011ded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DED 10676 bytes
SHA-256: addae277b68946d0f1c211f96ccc43d0ff31fc8e9e6e1e41c416afb5236854ad

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