PDF malware analysis — malicious · f698525d747a8555

MALICIOUS

PDF

66.5 KB Created: 2021-09-05 21:02:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 2c4e946cd657d34951322784997d9a88 SHA-1: 01834acfe8f1ccdc39da6024ebbd2e655cf83978 SHA-256: f698525d747a8555bdf52e1f408ef8b0ead2c94e39815fb00addf928487aefcb

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the nature of link farms in PDFs often involves JavaScript to facilitate redirects.

Machine Learning

Nyx PDF Classifier malicious score 0.5956

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://isabellepieman.com/userfiles/file/gatoziwageja.pdf In PDF document text
- https://newline-eg.com/userfiles/file/fuvoriragamafalafapuwaje.pdfIn PDF document text
- http://korvet-sp.ru/userfiles/file/sutebudujisigifam.pdfIn PDF document text
- https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/2953a7f677023e496ff9f56ce1812757/nefol.pdfIn PDF document text
- http://chornakorn-packing.com/ckfinder/userfiles/files/68839571892.pdfIn PDF document text
- http://www.sictombbi.fr/ckfinder/userfiles/files/7670098055.pdfIn PDF document text
- http://cogersquest.com/clients/f/f6/f6194b381802d71b6842d6160e8859b1/File/16525442992.pdfIn PDF document text
- http://generale-bureautique.fr/gdb/files/file/21733139500.pdfIn PDF document text
- https://alajuusa.ee/media/contents/file/46083258742.pdfIn PDF document text
- http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160d702114d850---palixumunitam.pdfIn PDF document text
- http://uceng.net/_UploadFile/Images/file/luzutewasena.pdfIn PDF document text
- https://svltv.in/userfiles/files/80787348637.pdfIn PDF document text
- http://dietgame.net/admin/fckeditor/data/file/20210820190424.pdfIn PDF document text
- http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1404d4a4ba---tofafugulekonerupopilo.pdfIn PDF document text
- https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/5f1b42232be78083dece17fc91d7e1d0/rovexedirofozolubunotuwa.pdfIn PDF document text
- http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/rlm0lfrm5phe63e5c34539rna4/68504765480.pdfIn PDF document text
- http://gzky.cn/dubeite/ckfinder/userfiles/files/20210630_125058.pdfIn PDF document text
- http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a72c719370d---93003948237.pdfIn PDF document text
- https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/92bbeec969b54260f374da7a3a59aba3/20777667059.pdfIn PDF document text
- http://odessahighschool1970.com/clients/7/70/70263b1be1b93b62200e198143f59f20/File/15576754888.pdfIn PDF document text
- http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/d9ba921c90528fa8f44171b0f194b9b0/3588082105.pdfIn PDF document text
- http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/4dk21bkccqufbop659i3q4rpd4/57001392713.pdfIn PDF document text
- https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608adab04bad6---jarutivave.pdfIn PDF document text
- https://chambres-lannion.fr/userfiles/file/ferewuso.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=de+morgan%27s+law+examples+pdfPDF link annotation
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000b950.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB950	15932 bytes
SHA-256: `69437ac855ae88d1061f5de6427a67c4db2744dd7f7e616ab0f046a85211127b`
`font_01_sfnt_off0000e241.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE241	10876 bytes
SHA-256: `db308867c52b86aa2a1f3603739c7d1f1af84e06d37c7b0808f39faabcb74c21`

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