PDF malware analysis — malicious · e48a1e9492036b1c

MALICIOUS

PDF

77.6 KB Created: 2021-09-05 08:21:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-24

MD5: a8a2a8f8f8613e2274818b7f899e604b SHA-1: add7d8ffab067d48de462cb0e4f27b767d935a28 SHA-256: e48a1e9492036b1ca152f4655e27dfebfb102c7b0327060b2eaeefcaabb4d21b

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

Nyx PDF Classifier malicious score 0.6678

Heuristics 5

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
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://medvor.ru/uplcv?utm_term=antrag+auf+steuerklassenwechsel+formular+pdf PDF link annotation
- https://bkairconditioner.cloud4demo.com/uploads/files/tovubawupe.pdfIn PDF document text
- http://farmaciafici.com/userfiles/files/pirorebud.pdfIn PDF document text
- http://firegallery.ru/img/upload/92747242890.pdfIn PDF document text
- http://stevis.cz/files/file/19671004540.pdfIn PDF document text
- http://portalcom-b2b.es/img/user///file/_0275243001623758785.pdfIn PDF document text
- https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/ef9igrda8lvnnbr4ccr6klbl3f/73561907453.pdfIn PDF document text
- http://toeicspeaking.net/_UploadFile/Images/file/waxozeg.pdfIn PDF document text
- https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/5k75kcdokont2qtqbt3a9to7bp/tanetiwanoxagu.pdfIn PDF document text
- http://klinikoral.com/img/userfiles/files/jimur.pdfIn PDF document text
- http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611991ec122eb---78177567400.pdfIn PDF document text
- http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/e2f037ab287db5f3da6683dbb26329dd/duxovobudekagizogapawuzip.pdfIn PDF document text
- http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b481b806d05---18493503569.pdfIn PDF document text
- https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/56419496d5f1a0c8129bcf56d69f75ed/60060178683.pdfIn PDF document text
- http://csc021.com/userfiles/file/20210715172710_xpfbvs.pdfIn PDF document text
- https://ngoctraithaibinhduong.com/uploads/news_file/74073530847.pdfIn PDF document text
- https://tractorpulling-emmeloord.nl/upload/file/35137597659.pdfIn PDF document text
- https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/ddc0f0b5dfc83c4592fda4e6deb8e73b/34033501745.pdfIn PDF document text
- https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db9feb47c95---85450933662.pdfIn PDF document text
- http://surtek.biz/image/files/20150119_013044.pdfIn PDF document text
- http://arcomproltd.com/userfiles/file/19198702960.pdfIn PDF document text
- http://tano-cable.com/d/files/60427841360.pdfIn PDF document text
- https://haps.company/wp-content/plugins/super-forms/uploads/php/files/09hjqja8jmsvjneufqbg32l9v5/69968881707.pdfIn PDF document text
- 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_off0000ebab.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEBAB	11232 bytes
SHA-256: `bd6f7b70ab1136a112bb6d026ccc182e428956d8f334291471b203d11f47933c`
`font_01_sfnt_off000105c4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x105C4	20840 bytes
SHA-256: `bae21dd0fe38c2ec338826d7e64ac6950d21ee1d41dc78b77a81bff1971feb74`

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