Malicious PDF — malware analysis report

Static analysis result for SHA-256 b37fadf3d9081dc4…

MALICIOUS

PDF

81.1 KB Created: 2021-09-07 20:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 31f51aa2255243b3c6f238cb968e191a SHA-1: 75f058fca01f95476c337ee6398d85bd57c5d277 SHA-256: b37fadf3d9081dc4c09b1f78f1c6d826bc207d21b4582299bb82caf8ef9e8981
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing a large number of links to various websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://nomylo.ru/uplcv?utm_term=understanding+quantum+mechanics+morrison+pdf PDF link annotation
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b043c7981---33657152429.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/36106002048.pdfIn PDF document text
    • http://pasted-radio.de/web/files/jozebezelikene.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/fikifovikevuralawe.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609767082c1f9---56045576971.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/75e9795243a1b37fd069488606d221ab/47701262571.pdfIn PDF document text
    • http://zuche0551.com/upload/file/xulifuvosogidut.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098d4a695c6c---gonitotazum.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/mebilawuv.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609425940662e---wojutuxoritikuxe.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/dugefuta.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a40daca1854---jusizaw.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/ralobakemez.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/8e3e314e4344680ed55f6d747b942d4a/besevisigozanotijewosizu.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/da572d1b7698a5979ead48862a266163/lovifata.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a095626c70---68881220571.pdfIn PDF document text
    • https://yildizwebpaket.com/calisma2/files/uploads/najoboguzesavitoj.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/04b69cc9c2deee5dad6c53a35873aab5/38551633843.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8ffd6b012---20739888230.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078b0099a818---78786816903.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/sixisopod.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16087ac18d33af---56662476569.pdfIn PDF document text
    • https://123natura.com/stockages/files/15598618506.pdfIn PDF document text
    • 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_off0000d760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD760 17316 bytes
SHA-256: 44034ee33905e36be3a669e75ad40fd9c4528c831c36280e1b78859230e0d212
font_01_sfnt_off000104a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A5 11276 bytes
SHA-256: 9739570d3f73e783fc0117c2bfc84492aab6cc6410ff4a6c4dd740394bdcec65
font_02_sfnt_off00011e6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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