Malicious PDF — malware analysis report

Static analysis result for SHA-256 0277ca61a1515cb9…

MALICIOUS

PDF

64.0 KB Created: 2021-09-30 11:15:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f7617d10310fbcf72ba5046b8c454e61 SHA-1: e13fcc8155932b7f47d68b623e568088c1bcfacb SHA-256: 0277ca61a1515cb997260706bcdb23bb2b6a5bc59e23787b910ba3c779abea39
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting domains. The embedded URLs suggest an attempt to lure users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6543

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://phayaotechno.com/UserFiles/File/33580114293.pdf In PDF document text
    • http://brainbond.ro/userfiles/file/vazeromibumod.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/18260533872.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/fekupiju.pdfIn PDF document text
    • http://jcnjl.com/userfiles/files/bemoseg.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/dazexeginewixeto.pdfIn PDF document text
    • https://duocvinhkim.com/userfiles/file/tavatifozax.pdfIn PDF document text
    • http://omnoiptv.com/outscapes/admin/ckeditor/uploads/ck/files/71183435983.pdfIn PDF document text
    • http://www.omt.ntou.edu.tw/ckfinder/userfiles/files/xoligegisivixibufasalup.pdfIn PDF document text
    • http://police8coop.com/UserFiles/file/40998558394.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614acc83e032e---51512371944.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021092512534075295.pdfIn PDF document text
    • http://sksound.com/userfiles/file/wodulejerisudaga.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/remetozovopurif.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/vesaderuwapojotini.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/52035523200.pdfIn PDF document text
    • http://viethanit.vn/hinhanh/file/xodopisafuwo.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc1dad76c3---78949671637.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613248171df67---96132516379.pdfIn PDF document text
    • http://wmsone.com/eimages/file/nujoxubinonawomab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=google+camera+apk+redmi+note+9PDF 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_off0000afd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E7 17216 bytes
SHA-256: 7c4bce83b5a498d02f370ea7b787a3eb5fca03432107524ba634c9b5f5611777

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