PDF malware analysis — malicious · fda9f60cffdff01d

MALICIOUS

PDF

84.8 KB Created: 2021-09-16 10:14:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 7fb672a1e10a0c8247ea9b8b5980d198 SHA-1: ada7ef8947c5ad31fd157b32c1a3cba8a322a2d9 SHA-256: fda9f60cffdff01dbcf399aa0ba6ab9c4285cf97484dda2c3534f220752dadd5

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and heuristic firings strongly suggest a phishing or trojan distribution attempt. No scripts were extracted, limiting the analysis to the document structure and embedded links.

Machine Learning

Nyx PDF Classifier suspicious score 0.2548

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://serka.com/serka/upload/files/bifovozewelikupotubos.pdf In PDF document text
- http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161409d8c5ea9b---wupudasewawadijefesote.pdfIn PDF document text
- http://profstil.az/userfiles/file/92203944846.pdfIn PDF document text
- https://adurucui.com/ckfinder/files/59558804300.pdfIn PDF document text
- http://lideparts.com/userfiles/file/1631717799.pdfIn PDF document text
- http://huabulaw.com/uploadpic/2021-9/file/2021091519012773499.pdfIn PDF document text
- https://watfordfairtrade.org/app/webroot/img/files/55165032117.pdfIn PDF document text
- http://cinstech-inspect-survey.com/fckeditor_userfiles/file/40813769627.pdfIn PDF document text
- http://midesignvn.com/uploads/files/bipajirenoradof.pdfIn PDF document text
- http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/161382a2bddd45---pezabatidufabisuxiw.pdfIn PDF document text
- http://novosib-sport.ru/ckfinder/userfiles/files/75616795221.pdfIn PDF document text
- https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/da09cf001623c53c08e15bbc1afa450e/vogazerinef.pdfIn PDF document text
- https://ysh.my/userfiles/file/rinabumafevejiwazex.pdfIn PDF document text
- http://torgoborud.org/images/file/gosadutokalavafaronomekof.pdfIn PDF document text
- http://smolninskayahotel.com/userfiles/file/lagox.pdfIn PDF document text
- https://zhansq.cn/upload/file/9983684509.pdfIn PDF document text
- https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/ae39135f6f2ab80aa67b905854519c5a/33194697873.pdfIn PDF document text
- http://2446665a.ru/ckfinder/userfiles/files/63651183804.pdfIn PDF document text
- http://cosmikkino.ru/sadm_files/73892663942.pdfIn PDF document text
- http://tajesink.com/Uploadfiles/files/pavilozijifom.pdfIn PDF document text
- http://fese.in/ienupdimages/images/files/jusununutudi.pdfIn PDF document text
- https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161314e3d86db1---75574714619.pdfIn PDF document text
- http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe58f286df---84784155255.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=save+activity+state+androidPDF 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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f14c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF14C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0001095e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1095E	17928 bytes
SHA-256: `706ea69d71bd89ab0cb31a3331d27c99260184a829d97a4d9afc46f62ec8bcdf`
`font_02_sfnt_off000137e7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x137E7	10572 bytes
SHA-256: `0fd7936b9f07b24386f57481101c872c129795221f4a6dce9459a8614f3c8fce`

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