Malicious PDF — malware analysis report

Static analysis result for SHA-256 edd6624bb25e768f…

MALICIOUS

PDF

73.4 KB Created: 2021-09-01 17:59:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 08ca60e32c00b30772c3e523819e9635 SHA-1: 24a981ccf0aceee2dd2b60e3c0a11ff398df1dab SHA-256: edd6624bb25e768f99f2c537d056d95ad9f92ca238f7757ee523be6f0b5d5fe4
154 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, a common technique for SEO manipulation or distributing malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The embedded URLs suggest an attempt to redirect users to potentially harmful content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6658

Heuristics 5

  • 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
  • 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://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/2quuva0kll10c1bd9mk8g4at97/tipawivisuzose.pdf In PDF document text
    • http://w-f-l.de/user_img/file/5890390661.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/1mvrido794bbkoua90nrj37uim/zefeda.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/81770733389.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608509c253d69---magutevelisu.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/e847f59773e0f6a274766a7b2cbf7581/20918427355.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/93043648931.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/1224560950.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/33568470518.pdfIn PDF document text
    • http://jp-cable.com/d/files/namot.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/59970691520.pdfIn PDF document text
    • http://travisreunion.com/clients/1/1d/1d9c560ef9ee6310b862f4c9d288d7bd/File/dupafakenimamijewizovopul.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/nurarivanamamitutudet.pdfIn PDF document text
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/qh7ci7r7a4jnff8t1dbaiarl5j/26261262970.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/texefizasigu.pdfIn PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/sidibakadakug.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/f78578955ee00c38d6279919895cd1b8/69641049125.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983894dd66c---33047718696.pdfIn PDF document text
    • http://chinoboxingclub.com/clients/36032/File/22395562635.pdfIn PDF document text
    • http://dwhs79.com/clients/15834/File/pibosatuzekozi.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/tonadimefiwididuwefugo.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/gfkbqoeagrpqf7c09mro4jsr71/37469145182.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/66377322486.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=photo+editor+change+color+of+objectPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA0 10860 bytes
SHA-256: 3681ab49314f2570d333af604251c54d070914553096f67235a8be15c5a6f6ce
font_01_sfnt_off0000f45f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45F 16840 bytes
SHA-256: 89afa5fec6f61248f300db841b4ddeb547af02c54f6e5065b13c4f0e6e25e4b2