Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c20222cb2382d00…

MALICIOUS

PDF

77.9 KB Created: 2021-06-20 01:03:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: cbd0d39a4f52ee8a0ec4a5d6861c36c3 SHA-1: 5c18c00804d94337c0e6198e400ea0bfdc4c9fe3 SHA-256: 3c20222cb2382d0068a1fdab82395fe451906c8a1f9729f3d580d193c7e042c9
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a clipboard-command (paste-and-run) lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/88d87878446ebf4779fcc77f55ef3057/56028742755.pdf In PDF document text
    • http://asupuro.com/upload/save_image/files/89603785014.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/rerobegotadokabipojob.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/14e6cd10cd0ab33f2dcae32bd76a33d7/31318458317.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/b8e48115919945a2878f6da9f8310410/61785512265.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/30225241581.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074d0bedb96f---bapelelupuzaku.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/2bc2aaa2da5d8c41a420a812b1a804a5/86640347468.pdfIn PDF document text
    • http://2016montemayorreunion.com/clients/e/e5/e530e98a7ee505477716bae2fe71cdef/File/fuvosikokojegaral.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/94563656507.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/03861cfa1904ff47d9038d32b96a4d14/gufaferuliveduzobademazur.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/zozizi.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/bmptda60l3hmb7h8318s6bk9v5/zozif.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16071015998823---lifasadupab.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eeb3f2ffb7---24435737151.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/kakogasukuzaditewopa.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file/%5C/43520898222.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/83146170298.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+run+iso+on+wiiPDF link annotation
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F4 4252 bytes
SHA-256: d7c77b0aabf96eb7710b9ff81e13fc35ec8f4daf8f085f5fc8ac6e14ee4f7264
font_01_sfnt_off0000f672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF672 11040 bytes
SHA-256: 1c1de320f45267c3651826b587d3607a529d40c6094d7c27fd1b7cb7a859ced9
font_02_sfnt_off00011c30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C30 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34