Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e28d4e542881638…

MALICIOUS

PDF

76.7 KB Created: 2021-09-09 05:24:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a8f388cf1da4b0f67786396715663672 SHA-1: bc0bf49ae2acb87e86c06bf149ca0c9033be86de SHA-256: 8e28d4e54288163868e5642202e81c2a27d7c95a16e38d29d1f028cca7a00362
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains a link farm pointing to numerous domains, many of which are hosted on compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content or phishing pages. No scripts were extracted, but the presence of numerous external URIs indicates a primary function of directing users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://oniceh.ru/uplcv?utm_term=i+know+in+tamil PDF link annotation
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/39094283088.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/16371883786.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/12798c03689fd619d2d2cd87745943ac/82492037161.pdfIn PDF document text
    • http://elfast.ru/userfiles/file/zelumazumemonozisitomupe.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/misamesemefafefenewuziwej.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/52967827775.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613942af3a2f5---51150833853.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/xigudofomapekafapopegirur.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/748380372.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/161304e0d9f8c9---jubonidalozimu.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/46319986883.pdfIn PDF document text
    • https://laflammerouge.ch/userfiles/files/58224294059.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/gigubedodebufesaved.pdfIn PDF document text
    • https://curvy.tw/upload/files/suvaxex.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/38342905713.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/lujikosu.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210906_40F78E80664630C7.pdfIn PDF document text
    • http://houselandia.ru/files/dajubatale.pdfIn PDF document text
    • http://jainfarms.com/uploads/zimukavefinele.pdfIn PDF document text
    • http://ydis.kr/userfiles/file/060819317309.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/getedisepafudazewo.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/metowejefuzifek.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_off0000c1f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1F3 20664 bytes
SHA-256: 9e3ca3ac36ba6abc5677650bdd158a3872ba0ae46f806acec5e35d136599aae8
font_01_sfnt_off0000f78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78F 10000 bytes
SHA-256: 971544965d18ab59b932539e522aaa6e7aa4edd4b628edd113dd2045f10ad587
font_02_sfnt_off00010dbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1