Malicious PDF — malware analysis report

Static analysis result for SHA-256 825931c495ebc2d1…

MALICIOUS

PDF

74.8 KB Created: 2021-09-16 01:42:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5ec3aec023acfb3905eb8c2c875273f9 SHA-1: 6dea69f7a7adf4f8b8ff0ab061fcbde4e6826f9d SHA-256: 825931c495ebc2d1723e669fedd3be9fa9d68bbd7d91a731497298b18e6f2983
124 Risk Score

Malware Insights

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

The file was detected as a PDF phishing trojan by ClamAV. Static analysis revealed numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the ClamAV detection strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4750

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://pixomot.ru/uplcv?utm_term=android+app+in+windows+10+laptop PDF link annotation
    • http://vatlieulamnha.com/media/ftp/file/70616846702.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/nbtk56jc1f0v06va8qml5bk5a5/warokirefosuv.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/49fe53926eb8c0fd02c2058d8609df1d/nadinasoz.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa4a95250c---44875060886.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/1k7qfeoga0dm60u9lua90gmdpv/giveje.pdfIn PDF document text
    • http://dsagco.com/Upload/file/86064101253.pdfIn PDF document text
    • http://dieterheich.de/images/uploads/file/sumitegupim.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/firizupobapegek.pdfIn PDF document text
    • http://suchanekstomatolog.pl/files/file/7086517154.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/poginifamuxijela.pdfIn PDF document text
    • http://ratchee.com/ckfinder/userfiles/files/vojovekilopita.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/98044772761.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/zigavivexibipuzon.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/76619438426.pdfIn PDF document text
    • http://packamate.com/userfiles/pipaketef.pdfIn PDF document text
    • https://moulindelarroque.com/userfiles/file/78973643773.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/jofidiwevofomotigira.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/25253261966.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/vukovowawimodakizajedarax.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/wuxujuniwerosoxodujeguzu.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/nopub.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/bewop.pdfIn PDF document text
    • https://meritumptt.pl/dokumenty/file/36614285028.pdfIn PDF document text
    • 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_off0000d743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD743 17084 bytes
SHA-256: a7faa07a9821c63042978d7f205f886109409744d48e9c46ae3011d539051e29
font_01_sfnt_off00010370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10370 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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