Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecad7f010e2fa7fa…

MALICIOUS

PDF

82.9 KB Created: 2021-09-01 19:34:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2dda9acb20a002292e67541c0bcd71c6 SHA-1: 2281c7f865cc1a62cf3fb12152d56ae123dded65 SHA-256: ecad7f010e2fa7fa56fca00596f51b814ad9dac79fffd5f9a3ecff651e9d9be0
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous external URLs, many hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple PDF link farm heuristics further supports this assessment, pointing towards a tactic of redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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://quickvideo.nl/userfiles/file/pazunigusatekugozu.pdf In PDF document text
    • https://digireg.nz/upload/texazerob.pdfIn PDF document text
    • https://saam.vn/images/content/file/68854818953.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/trilmbf01e4noa4jqmbk6j0a5m/60860485985.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/a66f9bc367883d0da83f1983ffbec109/podenavajinemexedunuxuz.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/577e9526bb1c2a959485e45922181ada/tamuwavon.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/kedax.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160befb6091653---matixojovanaf.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/vk1oepfuhb88j9pk8ffvk0iii6/36763399001.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/pomeboragufoje.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021062520523767.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8097331466---15812750972.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/1c1c73912eeaff126a1f414c039db6fb/18680443976.pdfIn PDF document text
    • https://badrivishal.com/media/ruzetuzafufuzu.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a455e53b39e---jowabanaleseguxuwako.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/52413823969.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/65692157729.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e92e60c720---mupadotuwujeraxa.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/lefokimuxabem.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/26863242192.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/70595561892.pdfIn PDF document text
    • http://bereanbaptistashton.com/clients/1/1c/1ca8668e480cca1e897b6add33210fc6/File/59049127810.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/8uevjg1uutg8q3dq595mpf29en/50791731705.pdfIn PDF document text
    • https://aaaxxion.info/images/file/44277846414.pdfIn PDF document text
    • http://jaika.in/images/documents/files/788878305.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607128df6c47b---39073938215.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=finland+in+japanesePDF 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_off0000e109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE109 17796 bytes
SHA-256: bcd8561fecf24fb4307318953a6a403aa014b28416ad97a9cfea5d9be44c8ad6
font_01_sfnt_off00010e3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3D 10176 bytes
SHA-256: 0fda8882564d9b8f2bef4b33331298c06f931a412952f5320152a10f777066ee
font_02_sfnt_off000124f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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