PDF malware analysis — malicious · c2310a50c9f7efc4

MALICIOUS

PDF

78.1 KB Created: 2021-09-03 01:35:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: b2236e63e12859106a53b3a180c5dd9c SHA-1: 33ba69144c96e51d2b5d7a72e546d7e6af377049 SHA-256: c2310a50c9f7efc410967acf15b1db5d24c56f3f160ced5507ee41919c013e89

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories. The ClamAV heuristic also flagged it as a phishing trojan. The presence of a link farm on disposable hosting and compromised sites suggests an attempt to lure users to malicious content or phishing pages.

Machine Learning

Nyx PDF Classifier suspicious score 0.4230

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 http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/ghi9racjpvqa67j2q8h4qubor4/lefib.pdf In PDF document text
- http://amdind.com/userfiles/file/vosavor.pdfIn PDF document text
- http://anaminfo.com/attachfile/file/68888041176.pdfIn PDF document text
- http://szyldkj.com/luodan/images/userfiles/file/gupilo.pdfIn PDF document text
- https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/2h21gbisee6nijv4chqhggnkrg/90936305065.pdfIn PDF document text
- https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/19011536652.pdfIn PDF document text
- http://unnatiwelfareorganization.com/ckfinder/userfiles/files/45080943755.pdfIn PDF document text
- http://meble-tk.pl/userfiles/file/digudegizokukux.pdfIn PDF document text
- http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608068465d5f0---majexazusabolato.pdfIn PDF document text
- http://severstroysnab.ru/userfiles/file/lakeluwozenirisunemebosiv.pdfIn PDF document text
- http://home-plast.ru/foto/files/81605651161.pdfIn PDF document text
- https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/6444e7dbe0aa9e3ab9884b33b66b3701/mogigivenakitidimeregamil.pdfIn PDF document text
- https://www.tristar-technology.com/ckfinder/userfiles/files/18338030522.pdfIn PDF document text
- http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca6f0828f8---fuxuwozotatilerakovijugu.pdfIn PDF document text
- http://cwesp.biz/upload/file/34042436269.pdfIn PDF document text
- https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/q38mrps7gthd2p9jpop1tac0r3/zotederak.pdfIn PDF document text
- https://autoskola-scp.com/files/faburakukopabakisi.pdfIn PDF document text
- https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afcd9a25d46---57791047013.pdfIn PDF document text
- https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/9a24b818a12ecf371826acf7398bad9b/83765062901.pdfIn PDF document text
- https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/d57qte410t7hrvpkfcrar0ugkk/56170755878.pdfIn PDF document text
- https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/bad79d61be586ce5f97bdd10cb77a46b/bukejulit.pdfIn PDF document text
- https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e028410b30---80006678071.pdfIn PDF document text
- http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b3129c10d---larafafazizimojuderafeb.pdfIn PDF document text
- http://dintainoodle.com/uploads/files/55064162347.pdfIn PDF document text
- http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ac751e6bb3a---luxewemu.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=fax+transmittal+sheet+pdfPDF 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_off0000dab6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDAB6	10720 bytes
SHA-256: `b0cb27c3cee23dd861a37d6db00d7ca49ea1d1566086d5d4824793d68be2e889`
`font_01_sfnt_off0000f312.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF312	16840 bytes
SHA-256: `1756cbbbc442ce56dfed7f0d9c74735ebba78c44bada51f25c4543e4ca9f0647`
`font_02_sfnt_off00011e64.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11E64	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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