PDF malware analysis — malicious · 41d393578e50edab

MALICIOUS

PDF

83.5 KB Created: 2021-09-05 22:11:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 719fd2f439481d5324920335bb1f2a79 SHA-1: 025a4d47bee1a75eb54dfe20a43b5e3ef1c15cb6 SHA-256: 41d393578e50edab63d64f19fcfca59602ea591a21eea268271995e64af76214

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites hosting PDF files, suggesting a link farm or phishing lure. The use of compromised CMS upload directories indicates an attempt to exploit public-facing applications for hosting malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9912

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
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
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.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081dab520f77---5556795827.pdf In PDF document text
- https://mk-promotions.com/ckfinder/userfiles/files/fidisezorixerutefobob.pdfIn PDF document text
- https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/370ef09614456a3c0237960e2ace0d0d/lelegexomimaxozumajejepa.pdfIn PDF document text
- http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2fede1c84---25132874892.pdfIn PDF document text
- http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b8bd33737---73619002724.pdfIn PDF document text
- http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f1166d00e63---6519544539.pdfIn PDF document text
- https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1a263dbda---ziroxerexolexujiretadedot.pdfIn PDF document text
- http://richmore.kr/uploadfile/fckeditor/file/69971518286.pdfIn PDF document text
- https://ever-progress.com/upload/files/47559798273.pdfIn PDF document text
- https://zippy-inc.com/app/webroot/userfiles/files/5824811044.pdfIn PDF document text
- http://marcth.pl/media/fck/file/76301176009.pdfIn PDF document text
- http://yishiweb.com/upfiles/files/20210710_145154.pdfIn PDF document text
- http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16121cfb9ded97---sejamoza.pdfIn PDF document text
- https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb80c1e227---rovep.pdfIn PDF document text
- https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/8k1e2lbat9bf6ifp4dlsko9h5b/37793085034.pdfIn PDF document text
- https://grdr.org/paidel/ckfinder/userfiles/files/51310600805.pdfIn PDF document text
- https://threadworx.com/thread/admin/uploads/file/39730498445.pdfIn PDF document text
- https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/595c076204824f91e6b6c647d46fd61c/4614018541.pdfIn PDF document text
- https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/j3qgi08tq7viearnaoq10q1ib2/rozegamudiretadizoxa.pdfIn PDF document text
- https://brahmagnanam.org/fck_uploads/file/47309801196.pdfIn PDF document text
- http://1970fchs50thclassreunion.com/clients/1/19/19770213778af891f1b13fa25f964f50/File/75879595456.pdfIn PDF document text
- http://phrabat.net/UserFiles/File/judipagija.pdfIn PDF document text
- https://aprilboya.com/userfiles/file/75861894276.pdfIn PDF document text
- https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/9f2e09f30d737f35fdd98585d56d953e/56812485141.pdfIn PDF document text
- http://dagmare.de/userfiles/file/kodeludenisimotokuwap.pdfIn PDF document text
- https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/0ea88c74afcd1a3f58eaf771ec42c672/50468340911.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=selenium+testing+tools+cookbook+3rd+edition+pdfPDF link annotation
- http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
- http://purl.org/dc/elements/1.1/In PDF document text
- http://ns.adobe.com/pdf/1.3/In PDF document text
- http://ns.adobe.com/xap/1.0/In PDF document text
- http://ns.adobe.com/xap/1.0/mm/In PDF document text
- http://ns.adobe.com/xap/1.0/rights/In 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_off0000dfe5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDFE5	17444 bytes
SHA-256: `d43236f1dbf90a678bdda27592fdfd14fdf4c5370120ed511cc365f16c47b774`
`font_01_sfnt_off00010d24.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10D24	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001253b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1253B	11380 bytes
SHA-256: `d672329acb1aec7ce22cac337b2e4e3c7ebc2a2c649c3e40dec22b14f7af63d8`

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