Malicious PDF — malware analysis report

Static analysis result for SHA-256 defc0c953e3e4d3e…

MALICIOUS

PDF

77.6 KB Created: 2021-10-26 05:49:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f535b412c603f1c04af530cec5c1cd9c SHA-1: 95ad87c49f7b5114c513e7177d88aebfed18881b SHA-256: defc0c953e3e4d3eb4fee0a0d5185f0be0298865a85d98f38c599d4d573de31b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of external URI heuristics and the compromised CMS upload link heuristic indicate the file's primary function is to redirect users to potentially malicious content hosted externally. No scripts were extracted, but the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8018

Heuristics 6

  • 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
  • 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://synerhu.ru/uplcv?utm_term=the+mighty+shadow PDF link annotation
    • http://czdashan.cn/uploadfile/file/2021092304313473499.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac876528cd---nowisip.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/6125947829.pdfIn PDF document text
    • https://actsonics.com/uploads/files/202110021942266146.pdfIn PDF document text
    • http://jonme.net/ckupload/files/44671567508.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/87722430754.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/84172621585.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1616a478d52bc0---72250523351.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/rekoluwesowukejajixolu.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/33147396276.pdfIn PDF document text
    • http://zoo-foto.cz/userfiles/file/77233681555.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16142c3ec52eef---soxozam.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/gosogofoku.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/38141028682.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/rojupagemigew.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff904bb795---55520079331.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343978e0844---77311484475.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-10-13/20211013031402859475.pdfIn PDF document text
    • https://femagnet.com/upload/edu/article/file/82230946697.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/fezuwopewafabodibuwepad.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/dulolefotepikevujupuvigoz.pdfIn PDF document text
    • 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_off0000d214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD214 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2B 10608 bytes
SHA-256: 8655a15cdcd9262e469325ad3df3d0a09cfe0ea3214df762e9f69094e30e76c7
font_02_sfnt_off0001024e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024E 18644 bytes
SHA-256: ffefecc808f213ab568af385132f696d2256f6495bf86ae2ecc65556dfba69e0

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