Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7c53eb779aa416d…

MALICIOUS

PDF

75.2 KB Created: 2021-09-17 22:46:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3b1bec31343ba24f9b3d3295449fcd73 SHA-1: 495887ee33675553ee449a302baec8213b95b77c SHA-256: e7c53eb779aa416d4c03662b3221d719a6b82b85db43edb190632c2f48b1fc99
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the extensive URL usage points to a downloader or redirector pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://coretry.ru/uplcv?utm_term=a+quiet+place+part+ii+torrent PDF link annotation
    • https://www.sophrologue-nimes.fr/upload/news/files/67944358984.pdfIn PDF document text
    • http://marikitaberbagi.com/userfiles/file/gugalamugeberun.pdfIn PDF document text
    • http://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/62034165906.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/71290458457.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/nhn299oj3u9kjma51uhlct9jkh/84886198453.pdfIn PDF document text
    • https://moolans.com/uploads/files/14049878756.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/33214950872.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/f33a029a49d85e89a3d828197dac6aaa/zijezixurun.pdfIn PDF document text
    • https://mmtours.si/uploads/98989300696.pdfIn PDF document text
    • https://peoplehelppeople.net/uploads/File/97290654032.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142e899d7529---60552702938.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/vetuberafeladorapatofemo.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c469b9646---34051588262.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/werivabebafofiwuburalelo.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/17611286383.pdfIn PDF document text
    • http://billsky.ee/files/file/vekimapiniviwow.pdfIn PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/50057830640.pdfIn PDF document text
    • https://samajsutra.com/userfiles/files/ribofi.pdfIn PDF document text
    • http://feg.vn/uploads/files/xebepopetagutuxawebabak.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/18184355698.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/85465066520.pdfIn PDF document text
    • http://konditsionery-odincovo.ru/upload_picture/file/nawapudawomim.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/zesola.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_off0000c48d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC48D 10424 bytes
SHA-256: 9e7a64a40b350ea5ff7ea8bba6081ed569bb901aafae107a96879d27c8249b20
font_01_sfnt_off0000dc42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC42 16852 bytes
SHA-256: 9c25d489ccf7a58d177711f3ad7ccbaed9743e12d8e39c20993f0be88f665bab
font_02_sfnt_off000107a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1