Malicious PDF — malware analysis report

Static analysis result for SHA-256 83c3d4248f68b652…

MALICIOUS

PDF

73.3 KB Created: 2021-09-24 13:45:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7b52ca87bdb658dc589f28b0fb4d58e4 SHA-1: 057e78904bbb00db38e907ab93d1cf7952365516 SHA-256: 83c3d4248f68b65231cf92508f87ba41c4ec29fc520a08e2e601787b08f812d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads and disposable domains. The embedded URLs and link farm structure suggest a phishing or scam campaign, likely intended to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://coretry.ru/uplcv?utm_term=avi+file+player+for+android PDF link annotation
    • https://karlholmbygg.se/UserFiles/files/98105890454.pdfIn PDF document text
    • http://eiffelflowersquesnel.com/userfiles/file/wudojad.pdfIn PDF document text
    • https://somos.co/dleyes/admin/fotos/file/notofal.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/28761966147.pdfIn PDF document text
    • http://atomleasing.ru/media/File/gofobojomas.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/32369969902.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210917_F14F5BC1772B77C0.pdfIn PDF document text
    • https://zlato-invest.cz/upload/files/dapufu.pdfIn PDF document text
    • http://ledins.lv/cms/file/75500715798.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614649d10f170---97207494428.pdfIn PDF document text
    • http://topbondtape.com/uploadss/file/14134814091.pdfIn PDF document text
    • http://xn--brneneskontor-landsforening-b0c.dk/userfiles/file/wiwafojukagijazitavuje.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-1/20210901094652582942.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/d0883766b502fdf98bb030ffab1577a2/61355794944.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/71888211080.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c93a0ba8d---240573323.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/9122b4d62519226d08294816e805d098/86598032453.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614167b64dbdd---11547185407.pdfIn PDF document text
    • http://opgzvh.hr/upload/file/fasalarekovaxakud.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/vudezifosenon.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/72588710327.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/bomovufi.pdfIn PDF document text
    • https://costarica4d.com/contents/files/73031642745.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/59600495869.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/jabiwemajo.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_off0000b832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB832 18680 bytes
SHA-256: 698c370d11e838079b98e0c78ab2e9c3d15fcccf501072a28ab5d954a0cafbf9
font_01_sfnt_off0000e830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE830 10384 bytes
SHA-256: 5da6e93e1b5b53b996a2f3e43b774bc38b7a1b459444afff84e2f4555636b861
font_02_sfnt_off0000ffc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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