Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a56a8cd2b037a33…

MALICIOUS

PDF

99.7 KB Created: 2021-07-19 02:27:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: a2566834c3f089aa3282560263ecf0a8 SHA-1: 71c121e86ba38e34d86b37633e40d322ee3b8a20 SHA-256: 5a56a8cd2b037a339a361e9d98ea27288d27557d4887163b49d13fa18d6a2f55
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm nature are indicative of a phishing or malware distribution campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9326

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://funperm.ru/content/file/linuvodanofilumigibof.pdf In PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/6ni1qjutssprc2n2gtl9eke3n0/zaxutuwodiw.pdfIn PDF document text
    • http://banghaija.com/userfiles/file/tawuder.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/74775936579.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/ghudsfigo5cvkuvmcuu3i91sh3/88401424205.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093cbe1f2786---jerusefenosazofapezotan.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/19117649677.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607456372a035---zapilufuwefutaxebegixoka.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/67398886689.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077c7aecc91f---56384525842.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/33o30073akrounu9mpnj58r09j/negexazozekigof.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/c78af0a92b06737bfa9412089b780803/dikasutotopuremuxoraku.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/lefagim.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/6950276e565531cb5508259b09441d6c/86329182027.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/a019f4ec4e641c296c541f09e7dc2740/65112885993.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/kabuzaniromunexuximas.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/545322dcf072df2ff65947448594d09f/95659962833.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc1abe5974---29884384126.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/85160642500.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091fe8b4b0eb---86866819009.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles//files/kewezasoworaguz.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/534348387.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/f4ovgkjhgdvr6p8catf1o9cg5s/46828922966.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/52046923616.pdfIn PDF document text
    • https://mashtalkandil.com/userfiles/file/42293947096.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088472362bfb---zunimakapu.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/bk09g2saa54ndns7mkqkq8hfoi/41791489105.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=hasty+marriage+contract+with+the+heir+endingPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010dec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DEC 18692 bytes
SHA-256: eb09ba4f7a5c6527dec7bc51858c513d275a701724607dcd67dfa11e975649aa
font_02_sfnt_off00013f8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F8B 3732 bytes
SHA-256: 1ab08dfc5b6424e36f8c2c768993a01f48569e27e041201dafb3ba69c6d8f8c8
font_03_sfnt_off00014e10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E10 10964 bytes
SHA-256: e7d9eb85ba1fe504e9f72a2dced9bc1f3adb05600441dc914375d4a823346377
font_04_sfnt_off0001671b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1671B 16584 bytes
SHA-256: 2f9e868b4acdb9d66496d769c07bf1b2fcdeb1ca56b381e95f4683baff7886ef

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