Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f2ace5d948b6191…

MALICIOUS

PDF

74.1 KB Created: 2021-09-06 23:33:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c706904602996d1aec8732b8a1dd54ee SHA-1: 2f8c93b2f06c9f9565856d9c6bb788cef8fbcf7e SHA-256: 4f2ace5d948b6191ca3c28b43faedf978d58271f3d87b75e0df2b059caff34d7
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to lure users to malicious sites. The PDF's structure and the nature of the URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://ambulatorioveterinariorigolon.eu/userfiles/files/lajomokoweriguda.pdf In PDF document text
    • http://biosite.ru/images/news/file/jumuxapo.pdfIn PDF document text
    • http://thucancakoihikari.com/luutru/files/zofefagov.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/38057817458.pdfIn PDF document text
    • http://wwstationery.com/files/file/47666254682.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/vetezinuxotonom.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/4oant3d250jd9vblk2njm3629k/7035025980.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/61482633656.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/63777688716.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/54029784610.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160842d8165172---31866305148.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084bcc7619e7---rirorul.pdfIn PDF document text
    • http://bilateralmatters.org/userfiles/file/vomofaliporerusuvise.pdfIn PDF document text
    • http://thegroverestaurantnj.com/userfiles/files/wivowalebogita.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/48922652252.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/bjeihs3rimpoatpaq8k0n44c70/kusikos.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089148c5561b---dipilapibilapeva.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16075b0df2ceda---jilefedumigoj.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/59557114063.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/86524974966.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f14e732915c---22598699062.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/81264297620.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=noktalama+i%C5%9Faretleri+testleri+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_off0000bd24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD24 10864 bytes
SHA-256: d15deca5cc286aedcfedc71d07b39a5e5bda84930d48ab4ae95c6a68511c5718
font_01_sfnt_off0000d5cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ede1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE1 17824 bytes
SHA-256: 786f3f44b876abd2754836f807b05305bf9183ad9cdf37ad7cb70b2a6a59f6ff