Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ba0c3fe80c7451b…

MALICIOUS

PDF

82.6 KB Created: 2021-09-05 21:21:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6f5477e31538138ed97a227a941bde92 SHA-1: 9fc84738317e5375bd5e1dea8528a8b6fc442797 SHA-256: 9ba0c3fe80c7451b6d7bd34e1a40d9d34c8aa1e46e047c96f34201c4d49aadc9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to multiple compromised WordPress upload directories, suggesting it is designed to host or distribute malicious content. The presence of these links and the overall detection score strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/0e6575da68312786b022ace228799693/54479642790.pdf In PDF document text
    • http://aven.su/userfiles/file/giwonawog.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/26511579453.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c16b54a986d---5706519398.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0ouu4u31cra8b4mg8nr1afj0g6/vobivebezafij.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a61f0c09143---65515022604.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/73076358116.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/39cad155757cd27b587c366f8bec5ed6/jajunok.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/jezusabefivujav.pdfIn PDF document text
    • http://intergeored.com/upload/File/zunuxazupagedafuwagivojix.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/mudosizikilebonulebekavan.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160966ed796b4f---kosaponi.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bfced2a2a75---89877065280.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612cbd402435e---8549875669.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c162abacf63---92014622579.pdfIn PDF document text
    • http://sharise.net/Uploadfiles/files/40059973594.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/65983062216.pdfIn PDF document text
    • https://aduanaldelvalle.mx/userfiles/file/suzakedu.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b2aeec04cda---voxemovedon.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/17309345866.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/d4f2aad479d194250b6257892b14816b/16679631888.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/kipepigujupegotedes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=manually+call+garbage+collector+c%23PDF 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_off0000dd2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f53c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53C 17436 bytes
SHA-256: b9b25d9c9b99553e76444d6117b20b65085058b9acc3c3b71d4cd40d2d34395b
font_02_sfnt_off000122f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F0 10492 bytes
SHA-256: 7e0babf13b6b653ed66db115b68b066df2e34e5102b58afa68ee8385397df11b

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