Malicious PDF — malware analysis report

Static analysis result for SHA-256 4826af3ad6c500d0…

MALICIOUS

PDF

70.3 KB Created: 2021-09-01 09:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 291a75172825c5da719229cc5db30437 SHA-1: 3c9b96d99b61058e59b27999c0eebce5ea77dcc7 SHA-256: 4826af3ad6c500d034378125f20c239f922f521008a94a017146cb9d8b6b3ae0
166 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 and exhibits characteristics of a link farm, hosting numerous URLs that point to external websites. The heuristic 'SE_LOLBIN_RUN_COMMAND' suggests potential execution of commands, possibly related to the embedded URL 'http://totaleclipse'. The presence of multiple links on compromised CMS uploads and disposable hosting further indicates a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3809

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/e478dca491b419738ce7a579ac9f5578/92307620643.pdf In PDF document text
    • http://kimandyoo.com/userfiles/file/1710363118.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160929018008fe---17226159555.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/39957573974.pdfIn PDF document text
    • http://haus-st-otmar.ch/userfiles/files/lonowijeko.pdfIn PDF document text
    • http://mariangelesorrico.com/galeria/files/pojitokife.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/a1ef46a1cb02b0fe88da81ce9b16687e/vigelamupa.pdfIn PDF document text
    • http://sbairs.com/datas/files/15571981553.pdfIn PDF document text
    • http://www.vnv.nu/admin/library/ckfinder/userfiles/files/zalomimokuwemarakakujefo.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/eruimse3kui64ngrqq4n67u6v7/tepogafeninisegagogosomif.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/76104308172.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/sufipifo.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/gubedugukamix.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161111aea2e236---punezog.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/bd31fcbdcfd4fc82558860263e943ec3/99828426740.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/mubefaxesazunonogedemesu.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd5ef8cf789---33476741999.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcf8488381---fizujekepujurepokikidobu.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8a344a41c---44990156076.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080f8a11bdf3---dawokefanuxur.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-7-10/20210710191155918486.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/gicmdv86r0sk6nogls8obqhec0/95222429591.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6f28f38325---5854240923.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b29cc0a8d---8134543315.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160dd97577d828---dimigozamogebisejejebu.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16076ada56c599---59132314023.pdfIn PDF document text
    • https://aspirans.com/files/file/86950972726.pdfIn PDF document text
    • http://totaleclipseIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=counting+days+in+real+estate+contract+contingenciesPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD24 16188 bytes
SHA-256: ac2a5a71fc53e7c32f2f85d562d44d76900a14b3e527401874e4ba818ba7e633
font_01_sfnt_off0000e690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE690 10788 bytes
SHA-256: 34dd51803cbfc072d2780fd338f5e738797c5e3bae3ad3ef079c41578cb752d7
font_02_sfnt_off0000ff6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1