Malicious PDF — malware analysis report

Static analysis result for SHA-256 e91f2c523d794c6f…

MALICIOUS

PDF

83.2 KB Created: 2021-08-17 14:32:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1e0c57c8325ce407fe0093c71372ec67 SHA-1: f4b7fe0f1174072b195c7fdd0d5c07f5e6d26670 SHA-256: e91f2c523d794c6fe6757e3e76c8df4412eac0eeb529e24afeb4b71c62fcb212
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7730

Heuristics 5

  • 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
  • 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://irlanc.ru/uplcv?utm_term=ejercicios+del+sintagma+nominal+con+soluciones PDF link annotation
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1610c73b6d9c2a---wodusanasaniz.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/929ee38ac796d6efe50a0d1ae083dbc9/99631238055.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/ov63b9v9bmk4ptnhc7bnr4brbs/gubebotofukopolapebedok.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607256bb73d8d---14391024552.pdfIn PDF document text
    • https://ewt.cz/res/file/74729997200.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/q587iegak8nr2qknjqi54vb2nu/89162318146.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/5939454576.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b27a97c2604---38945564121.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070006c3b27f---juzanowugavow.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/7ao261oa53574bmkpr0ld5ho6g/70488149915.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073b583da8e6---pimifonitajutokadozuxoji.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb9237a5c8---rukibadupidupijivimujeded.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/fikojunetileselesupel.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/kodimetisamariluvomerovo.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160f1b265c7db8---34666050968.pdfIn PDF document text
    • https://shoreluxurylimos.com/userfiles/files/pudevuxogolezubedired.pdfIn PDF document text
    • http://jucal.es/images/file/23785936423.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9541af83f---7525263882.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/34208988267.pdfIn PDF document text
    • http://loveforlungs.com/clients/a/a9/a9a80f3a93b7553e0860ec1960497db0/File/24000575468.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/bjjlv91hcsvji43hgait6m62t5/kebavetuj.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/60118416152.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/envsf9miooq8ms58d1k8m8v0pm/samok.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/pepafitekodibodati.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/didogumal.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/39121514131.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16111488dc58e5---zukuma.pdfIn 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_off0000f24a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24A 10928 bytes
SHA-256: 2205dd840da259105dcff1948795cfb0c9d68805fc972bd53eba904463b8ed1b
font_01_sfnt_off00010b53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12365 17336 bytes
SHA-256: 9a753e988813c8a836b453d625860043ba6108796dba6436fbf4c58a50d12d60

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