Malicious PDF — malware analysis report

Static analysis result for SHA-256 1000203677677b9c…

MALICIOUS

PDF

90.0 KB Created: 2021-09-05 22:36:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 428448444aab0f78fac93d8dcac6b87a SHA-1: 30eb53d93e8fdaba8d95ed531d57ddf2281966a6 SHA-256: 1000203677677b9c612a022d482a07073d8a7683cc35efcf782d01679cfc234d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the presence of external URI links and the overall detection pattern indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://rubin2000-distribuitorshop.ro/userfiles/file/vuwuvunefuwala.pdf In PDF document text
    • http://ginzaoakland.com/uploads/files/51438869666.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/d9a46ce881f32428a11c2c48d877067f/30621540872.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/gatexaxapuxof.pdfIn PDF document text
    • http://krallarintavugu.com/upload/file/nixixin.pdfIn PDF document text
    • http://vertinu.lt/ckfinder/userfiles/files/fowamipaxilobufezawezi.pdfIn PDF document text
    • https://aghs.in/ckfinder/userfiles/files/vitixu.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e30b974fc---37645335824.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ef8f5b661---zurorabav.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609460a42e7d4---27346431366.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/padafuzato.pdfIn PDF document text
    • http://intrinhgia.com/admin/webroot/upload/image/files/guwaxavijuxiribetelejir.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612efc914b68e---71051076538.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/15450284708.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/9497a6c242d5976c8fcd9f1810846ee2/roxebonulumiwikogogawipux.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/74481481230.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/xonolopuxukuzejopanitelob.pdfIn PDF document text
    • http://teifsepahan.com/files/file/nifizefagekajasosuf.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/12999544639.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/dojinaterejafasofamar.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/cr8elta1e7fjqg01ncfsu0hq53/59717212388.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/2a906678f31c5a5a7204f34bd78c4310/52303412699.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/79660a0892888863fa7fc8b1ed7496aa/45509626888.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=if+clauses+typ+2+und+3+%C3%BCbungen+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_off0000f4ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AE 11272 bytes
SHA-256: cb66041b753f3e9c7ef2bdcf4841044a4455ec90b90b340354d3363a875ebf4d
font_01_sfnt_off00010eb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C7 19620 bytes
SHA-256: 69172fbdd18642c525e2c27580e0433014f457ed2d86643068b13f53a7a162da