Malicious PDF — malware analysis report

Static analysis result for SHA-256 1127a685188ba086…

MALICIOUS

PDF

86.7 KB Created: 2021-07-05 19:05:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0382ececd7fd3bef5413166c9b01fa50 SHA-1: 3cede2a43562959a690d1032d65328c15683b8ba SHA-256: 1127a685188ba086d75f5a09b80899c91a6abefdeaf7b04cc382069210713991
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated, preventing analysis of its specific content, but the heuristic firings strongly indicate a malicious intent to leverage external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5978

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 https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/6b696a2c23787fb16e6e04cc8689b880/26363150908.pdf In PDF document text
    • https://beauti-full.ru/uploads/files/14432420609.pdfIn PDF document text
    • https://nasroglobal.com/userfiles/file/tikenanaj.pdfIn PDF document text
    • http://reunionclass.com/clients/7469/File/vijib.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/16001061539.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/tavuxegomagu.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160838b6525e51---xufifipimake.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a31df6923ce---67936753035.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/2h4sjn9rdjbgsviiauouqatjh2/47932258011.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/955636385.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/jh05gf6jgof9gn4jsmnggpj754/29347472937.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078292d6ace8---waseriwugupuwaverasifev.pdfIn PDF document text
    • http://taskentcompany.com/userfiles/file/2579019990.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/21808128698.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/28643175966.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098528165820---79065460817.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/57745340427.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/tidatibigizuvijoto.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160768a94ee1de---71790533721.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba874023ea9---zapuma.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/22895277673.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/m9i7lolgtfl7nulupugjhhtof1/24989564731.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/08a2c8d55725015ce040d8ad9aeb1315/rulerame.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/95239152399.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=rote+memory+learningPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000147a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1