PDF malware analysis — malicious · da5143e5d75c2e19

MALICIOUS

PDF

74.9 KB Created: 2021-09-03 04:18:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 04ada365f73716f3e1be73ee2775fbf0 SHA-1: e93d187c26002a38fb298f2323f3bacb18900ae9 SHA-256: da5143e5d75c2e196b0e0300a343233bdc1646f86b191dc227b1d54a6915ad8b

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous external URIs and links to potentially compromised websites, suggesting it is part of a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.7616

Heuristics 5

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
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://crewmak.ru/uplcv?utm_term=usa+hockey+scoresheet+pdf PDF link annotation
- http://sakaryakasaplarodasi.org/userfiles/file/71038690698.pdfIn PDF document text
- http://gzky.cn/dubeite/ckfinder/userfiles/files/20210805_170116.pdfIn PDF document text
- https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/55f8c1344a0beaf922b5d4badc339124/40736353639.pdfIn PDF document text
- http://video-cycling.de/files/file/gawutuwo.pdfIn PDF document text
- http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/wusadenosorepa.pdfIn PDF document text
- https://apoiotelecom.com/imagens/img_fckeditor/file/61717787904.pdfIn PDF document text
- https://daynexweb.com/upload/ckfinder/files/nofovubabozizovixusatar.pdfIn PDF document text
- http://goldenbaycruisesagent.com/userfiles/file/vodirisixora.pdfIn PDF document text
- http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16085bff0a6856---62154860156.pdfIn PDF document text
- https://gotamsui.com/ck_imgs/files/bulevebupejanekasiwexibug.pdfIn PDF document text
- http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f956db47fd---47617971756.pdfIn PDF document text
- http://canxetaidientu.com/images/file/ledaxosizofaxewamilos.pdfIn PDF document text
- https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/59fef5a0c655658fda1a409e2e3a9096/85895808447.pdfIn PDF document text
- http://arunimaflavours.com/userfiles/file/26276645775.pdfIn PDF document text
- http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f543860707---tadukerojafokeluk.pdfIn PDF document text
- https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/22a30405ba5a216716d519f9a2d8336f/fepilogesonexuravivowe.pdfIn PDF document text
- http://bettaletroom.com/file_media/file_image/file/terikux.pdfIn PDF document text
- https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/o59l58o8gd5pkmdtdgiepopbaf/56768321066.pdfIn PDF document text
- https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/d7af47fb5fb1f29bdb467440e2371787/dovadeluj.pdfIn PDF document text
- http://olddieselparts.com/ckfinder/userfiles/files/19371670709.pdfIn PDF document text
- http://cukiernia-waltar.pl/qcms/userfiles/file/tapifaboso.pdfIn PDF document text
- https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a99d5b139d---79150838003.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_off0000c96e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC96E	17396 bytes
SHA-256: `7838730e59110ba17bd32f4fa1807449e9313843eface212f421fcd956bdb4b9`
`font_01_sfnt_off0000f652.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF652	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010e69.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10E69	10688 bytes
SHA-256: `9aefbced85e5362719b4b0c9957f7e94b5c9ecbf7328d23e6fd8a51a49363f1d`

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