Malicious PDF — malware analysis report

Static analysis result for SHA-256 e14efcd4d707f9e0…

MALICIOUS

PDF

83.5 KB Created: 2021-09-11 18:47:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5065139b770524e69694087f9dba72ed SHA-1: 3614d6b9a3d97f9fe498a2ddde914dd98c97a895 SHA-256: e14efcd4d707f9e0fdfd1276e2743211c269f7b44328a967f1fcbe8833c3cb35
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are hosted on disposable domains, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://kimura-shihoshoshi.com/userfiles/file/nevigevagazuponopano.pdf In PDF document text
    • http://jl-vacuum.com/upload/files/84491131360.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/19152020244.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/2048431622.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/99666919759.pdfIn PDF document text
    • http://erictex.com/ufiles/files/63084334935.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/54144736940.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/35dde72f89ce4045ef19df79e1578e40/zezorovawedirexuvajera.pdfIn PDF document text
    • http://recrute.fr/files/files/95106948326.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/ecd6fe7d623ba6eccd9e5e3f48c118e7/25329700447.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/guvuvivugikeriz.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/pobad.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/fe70722da8df973f5dce142c5c69d5a0/jefisifununelapem.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/gokanezijirowagop.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd43310c94---42345956439.pdfIn PDF document text
    • http://stroi-sistema.ru/img/fizusavon.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/sideziluzadajeletez.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/fuxavogebasibakuwafidozet.pdfIn PDF document text
    • https://jgranit.pl/userfiles/file/91553339283.pdfIn PDF document text
    • http://goldenstarhotel.vn/images/uploads/files/78402498209.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/dc0040ebb2af2cb8f7d4ff8d97900266/jaliwezes.pdfIn PDF document text
    • https://stvorki.ru/files/file/87339291811.pdfIn PDF document text
    • http://sineadstone.com/userfiles/file/29768806937.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/68f2a90c3866130dbc14b9a7ef2bd01b/xibutafikutedasi.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/dvegoghbfg8i8seu8jta1n6km5/degeseligonade.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=bad+things+that+start+with+kPDF 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_off0000de6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6A 10460 bytes
SHA-256: e17eeba66bfc124a798f6c3472270a07ee806d7b992dee733afb07fd8406c05b
font_01_sfnt_off0000f5f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F0 19456 bytes
SHA-256: cc904ccb903814ff1fa9c3af18eb6416ae3405e3f0794b8e736aa460ee3398d4
font_02_sfnt_off00012887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12887 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1