PDF malware analysis — malicious · c84f070a1bbebd5f

MALICIOUS

PDF

70.3 KB Created: 2021-09-29 12:33:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31

MD5: b041fb752c371d0709d7fd1631c9adc6 SHA-1: cd11198e26cce0c4c5e64004ace8b49135a6059b SHA-256: c84f070a1bbebd5fc914e11cde1d690bb139385685211ad50e528e1d870d0a86

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent. While no scripts were directly extracted, the nature of the URLs suggests a phishing or malware distribution scheme, likely delivered via spearphishing.

Machine Learning

Nyx PDF Classifier suspicious score 0.4733

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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=holes+louis+sachar+read+online PDF link annotation
- https://produse-zilan.ro/files/11141779800.pdfIn PDF document text
- https://sieuthimaycafe.vn/uploads/file/danafekesik.pdfIn PDF document text
- http://anpo.vn/upload/files/lapajirafaraven.pdfIn PDF document text
- http://psycare-spb.com/userfiles/file/tewawiwadoba.pdfIn PDF document text
- http://themetamorphoseprogram.com/userfiles/file/faxosuwujefurodi.pdfIn PDF document text
- http://mannaz.pl/userfiles1/file/pesut.pdfIn PDF document text
- http://ccswcd.com/userfiles/file/33487180448.pdfIn PDF document text
- https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/vuzixajesefi.pdfIn PDF document text
- http://liavanhaeringen.nl/userfiles/files/88891043569.pdfIn PDF document text
- https://aokman-drive.com/d/files/94104322482.pdfIn PDF document text
- http://mu-rrrc.com/userfiles/file/mimejiwukututikokip.pdfIn PDF document text
- http://vnationwide.com/userfiles/files/42572875717.pdfIn PDF document text
- http://indianspringhomes.com/userfiles/files/kibusi.pdfIn PDF document text
- https://dichvumoinoi.com/ckfinder/userfiles/files/98779139571.pdfIn PDF document text
- http://ssaisarang.com/ckfinder/userfiles/files/4556297380.pdfIn PDF document text
- http://autolavaggiocraparotta.it/userfiles/files/83802837593.pdfIn PDF document text
- http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161438b7631bc4---mapurumanodijubo.pdfIn PDF document text
- http://hotel-gerard-dalsace.com/upload/document/74128203274.pdfIn PDF document text
- https://swiz.eu/files/editor/rovekimazazaxexo.pdfIn PDF document text
- http://bizbecho.com/pa/trainstation/uploads/image/file/ruvodive.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392930a4ad4---99974494153.pdfIn PDF document text
- https://selispin.com/calisma2/files/uploads/vevevigemaditoxevataw.pdfIn PDF document text
- http://darangyi.com/userData/board/file/72123134582.pdfIn PDF document text
- https://guijek.com/userfiles/file/tonolu.pdfIn PDF document text
- https://tedesco.pl/userfiles/file/80728317601.pdfIn PDF document text
- https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/ec4b805feb09ae18a84716304a2d187f/sowegitigikomotidet.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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000bd15.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBD15	10460 bytes
SHA-256: `7785ae268d4e8c232926ddc2a3b37d14784877b55f60d0de406ce2c6f770ce8e`
`font_01_sfnt_off0000d4ad.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD4AD	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000ecbf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xECBF	17880 bytes
SHA-256: `ced4c6b20224d16a7b6e18147ed9f52c4445b2d13c218b823a1f6105ce1f66fd`

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