Malicious PDF — malware analysis report

Static analysis result for SHA-256 11b30c0c9f447230…

MALICIOUS

PDF

68.1 KB Created: 2021-09-06 02:07:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4f3fba1142da36e7213d937211d08a5a SHA-1: c479c2ff28326aa532154016170cf2a26f331c28 SHA-256: 11b30c0c9f447230ddc11221af20a98ef34899ef6d0324b391cae31c5916cc96
176 Risk Score

Malware Insights

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

This PDF exhibits characteristics of a phishing lure, utilizing an image-only design with clickable actions to redirect users to external links. Multiple heuristics indicate a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://creativeindustries.ru/uploads/userfiles/file/3976736608.pdf In PDF document text
    • https://jahanchart.ir/data/files/file/modulabuludekuxi.pdfIn PDF document text
    • http://yksskj.com/ckfinder/userfiles/files/42670897455.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/36845960896.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/ufcv3q9vbqoi9vdc6te59n7rps/pilokimu.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/kaxixa.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/ed35cba1a94954263505d264509eaa39/41190851998.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/j10708b87bc4fjj1db3l51h003/57171225857.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/dugagidonaxokufo.pdfIn PDF document text
    • https://talleresimad.com/images/subidas/files/pugalamerebabuf.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160899e838053b---sulojuxovi.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a6dcd60b29f---siroseg.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/bolibufigobogowoxeben.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/1113460728.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886961a50b2---wiwutinorudax.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/61502559210.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/f55cd4818a1e151a68ad220c91e51bf2/70720866471.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/0a99e3713538373a11011706fbb030b1/435570650.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/ziporovekadelo.pdfIn PDF document text
    • http://fkhd.cz/data/img/vipes.pdfIn PDF document text
    • https://inprovitperu.com/ckfinder/userfiles/files/mezigafitimokib.pdfIn PDF document text
    • http://softtox.pl/new/userfiles/file/dadogisugafosom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=basic+trigonometry+pdfPDF 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_off0000af27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF27 13948 bytes
SHA-256: e80997bcdf3d41b8e5cb50e020d6ad45518981ca096c89dfb59430a1c64301ab
font_01_sfnt_off0000d1b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B5 11084 bytes
SHA-256: 90e21a3bbb25f3a6ec020b6d71cbb7dc582080553ab6f37c1fa60be3dfe4ee2b
font_02_sfnt_off0000eb68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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