Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a499ad9f7cdc16e…

MALICIOUS

PDF

86.5 KB Created: 2021-07-26 04:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3dd1ec05168691ed7608383d6255d074 SHA-1: 2664bac97f6cc5e83e1628d9819a3da310df5c04 SHA-256: 4a499ad9f7cdc16e5936576a3c1dc6a15f910406a6dc9bb41119b589bd7f5c3b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution through these linked resources. No scripts were extracted, but the structure and URL patterns suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/evci4a0n4ju6996af77gf4d3t5/gawubemexebebojiwusebuwa.pdf In PDF document text
    • http://nedirajtebosnu.net/userfiles/file/levotigixagalidaroxod.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a38083cbebc---zokuzafimederekakijuriw.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/vegutisegogajoravu.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160850bf08d58a---zeworuvebufome.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/ximikotejemawe.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/bevilanozezolusatonenu.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/748882e0f19c7ca54c5908fb15e3a82b/bifepezaraf.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/1uds8ci0vmv579emuf60933b3t/xuzigegevesubolog.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e35c8643c---bumegirafuwopigu.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/lerajafukutalibemuwawop.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075fdc09a0c6---21626900350.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ff97dcd3a---badug.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/2d5e97d0cf57ffedcd42fe1e6fa9b08e/3987382726.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4112d491b3---jonezufiwetame.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/sumakixulukub.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/kazijarosugologelo.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/a1ab367daa738f87d3d0f6ea8c147c63/nopilaselovu.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160978e7521571---36449202010.pdfIn PDF document text
    • http://chipmax.in/chipmax/ckfinder/userfiles/files/15147121845.pdfIn PDF document text
    • https://kawanmto.info/contents//files/xoxukebuxapiberibusoded.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/98747468182.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/lutufifexinapowuridu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=examen+de+diagnostico+matematicas+primer+grado+secundaria+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_off0000e8f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F4 11100 bytes
SHA-256: c3199dbb9164270781cb25a4ec400f669f5a9fcdc65639a1df7a6c09e10c4db3
font_01_sfnt_off000102a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A0 18136 bytes
SHA-256: 8df708b3a2a5e428b71c3f90475671a5a5f76e914f5c057562599e1301f39948
font_02_sfnt_off000130cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1