Malicious PDF — malware analysis report

Static analysis result for SHA-256 92983f167c338c8f…

MALICIOUS

PDF

71.0 KB Created: 2021-09-26 01:03:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9edd52a6ebd3da8ae2b7797eb62be185 SHA-1: ccbb07111b2ba1025fb7d4491137b969f1d17f39 SHA-256: 92983f167c338c8f30e7455af5008adeaaa161adefb8baea303416010d14e992
124 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ClamAV, specifically as a phishing trojan. Static analysis reveals it functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads. The presence of numerous links on disposable hosting further supports a malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4393

Heuristics 5

  • 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
  • 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.greenfield-sustainability.com/images/files/49257457006.pdf In PDF document text
    • https://siam-royal-view.ru/data/files/37320514987.pdfIn PDF document text
    • http://forepic.com/_UploadFile/Images/file/xebef.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1614df100e8bef---79485778149.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/numopagob.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/3703567835.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/9875742483.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/xuwekivuxiwuwefuzomupolo.pdfIn PDF document text
    • http://dade666.com/userfiles/202109file/2021091919334970554.pdfIn PDF document text
    • https://avflash.nl/upload/files/bebulodumululararixatu.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/xulakixaxizobuwefesopif.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/26e617adbe3dbf74fbf0c879eafb0a9b/kagobulejusox.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/c8b479a49a3f052a0a728d1c7c6cd042/82684621055.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/32714798696.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/ramujadunapigugen.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/29699965459.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/39646906327.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/75918778647.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/58251686980.pdfIn PDF document text
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/3659163385.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210908_035534.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/kovijopedekulowure.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/7122349505.pdfIn PDF document text
    • http://italy-ex.com/images/blog/file/76066184391.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=skicka+bilder+mellan+iphone+och+androidPDF 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_off0000e10d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10D 10820 bytes
SHA-256: ba8c4956829d92191d6e48ffc9d5ce77229a9eab35f3a6334e83022c69791fcd
font_01_sfnt_off0000f97e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1