Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f82576dcd9d4456…

MALICIOUS

PDF

76.9 KB Created: 2021-09-18 04:54:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 07dc851ae85bf9eb3902b1e9ca2616d2 SHA-1: dc00f7ab20a7f7979804872e5dbc73b33c3be2da SHA-256: 4f82576dcd9d445687f6469bbe5dc42845ab6fa42abccbd02cfd778761488c65
196 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to potentially compromised websites and disposable hosting, indicating a link farm designed to redirect users. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may also be used to trick users into providing passwords for archives, a common tactic to bypass security gateways.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://inwebjor.ru/uplcv?utm_term=sonic+and+sega+all+stars+racing+apk PDF link annotation
    • http://irinabailey.com/upload/files/77600871107.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/zegonitepafuzivavozun.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/pepeledutotulod.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/voropowakutanevogiwapi.pdfIn PDF document text
    • https://seo-methodes.com/userfiles/file/wafozoba.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/sukalivizavokironize.pdfIn PDF document text
    • http://abwrva.com/uploads/files/tapatizilewamunofub.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/86873009081.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/jawubilozirupi.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/i3l5gjkujinpnaev6isdaf0e24/61083648277.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/f431f00c56024b59a495b6ed116a5112/ragukuzurujewesot.pdfIn PDF document text
    • https://mollis.rs/files/xizixigujasijitibexatapob.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210905225644.pdfIn PDF document text
    • https://upaspor.com/resimler/files/rukuporuxemipori.pdfIn PDF document text
    • https://satellietgroep.nl/userfiles/files/gapojejex.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/2021918550455855.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/roteredewoxebimolurapodab.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/9nl7e4is192ffjocvdbo6j8a2k/riwakojovevemenafonodaro.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/gekigo.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/16814821452.pdfIn PDF document text
    • http://somkuthyoptika.hu/editor_up/97488355496.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/52015430798.pdfIn PDF document text
    • https://renteci.com/imagens/file/solutepa.pdfIn PDF document text
    • http://vning.net/filespath/files/20210831235411.pdfIn PDF document text
    • https://onderhoudnlgarantie.nl/upload/file/30876931318.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/31306064155.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dad865e4d4---70493337054.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_off0000c729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC729 10856 bytes
SHA-256: cdff713c33a952be5ce3c71d752bd4d55d0c422509d4d19d125cf41e58343e47
font_01_sfnt_off0000e01e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF830 17420 bytes
SHA-256: 119fbd449e22d0339bf87ae5b0ea63204b3ead1b93eee4f10cd8559aee0c8d3e

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