Malicious PDF — malware analysis report

Static analysis result for SHA-256 3756994d2343a622…

MALICIOUS

PDF

86.1 KB Created: 2021-06-30 23:10:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 44c8cff9c912d6bb8c864644f47c245e SHA-1: 2e8574e1036194028e150c785c878eca645fe283 SHA-256: 3756994d2343a622e6b3046faeed2bbcc89931c34f52303d5182c92378af699a
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using disposable or compromised hosting for link distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to 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 http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/rl2j9ft5sa5ca7t3v7fmtqchf6/varamotirutezavovavubirer.pdf In PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608175f7b5417---97510561635.pdfIn PDF document text
    • http://suachuabaoduongmaynenkhi.com/img_quanganh/files/56299381305.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/sixax.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608707eaa7906---55196704150.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078dfce74a5e---73058868611.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/xojobaka.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/6149a09145847da77d821fc5742bcdea/34702514265.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/9092563daa20c453103cad424a32f842/xalegotapopudodidima.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/008458a152d64a64bb3fc8ef814156a0/xalidakefom.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823162ad7e0---90314526231.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160804482551a5---31444912711.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa075eac8a---vekezene.pdfIn PDF document text
    • http://carszana.com/image/upload/File/25603302412.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765cf8af4a0---56980545372.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/6eg2ib0fdqqkn461drfulrv275/30476377426.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/tinisemasajorupama.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/lanogekibanefibupaseb.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/llhbqce3sk7b4gto27rfpf3u8m/76115304576.pdfIn PDF document text
    • https://rm-parketi.si/uploads/ziwuvimapo.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/tusidabetozu.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f355685d9---9783072846.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/194ca270o0vula3hl1d5a4hao2/39740369251.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809ce0b7409---88310098839.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=swot+analysis+for+street+food+businessPDF link annotation
    • 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_off0000ee6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6B 10864 bytes
SHA-256: 8822e443dd7d40124c7686cc4b0d81e0f8c246fb6f46926cb0648913e5fe87a7
font_01_sfnt_off000107b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B0 16660 bytes
SHA-256: 8244d9995bad4a865f6cfacfa1182407386543d584f0bca2b959cfe2bcfb5964
font_02_sfnt_off000132c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1