PDF malware analysis — malicious · 943bc72f49799684

MALICIOUS

PDF

86.8 KB Created: 2021-09-02 10:34:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 73374b8a11e5c8d0de4957dbf1a28882 SHA-1: bd1b038436f13e4246c2e1d69fbd80d1420e76b2 SHA-256: 943bc72f49799684ca5801adc3b0b75972b160bde8ad070f6aef9963cf40c011

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised WordPress uploads and disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The document body is unreadable, but the heuristics and URLs strongly indicate a phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9982

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 https://cructi.ru/uplcv?utm_term=t1+and+t2+hypointense+lesion+spine PDF link annotation
- http://hugslock.com/app/webroot/img/files/9878097572.pdfIn PDF document text
- https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/a4f0dcde246422f8fde375a8305cb93e/38129629105.pdfIn PDF document text
- http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e52a940a2---lepir.pdfIn PDF document text
- http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/161237f1755363---5469796601.pdfIn PDF document text
- http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160778c0db83a9---21101697692.pdfIn PDF document text
- http://ristorantebiscione.com/userfiles/files/dalujuwuvekovegupu.pdfIn PDF document text
- http://brmhn.com/userfiles/file/20210716023628_byt6b4.pdfIn PDF document text
- https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/7vh5bf7t94imuif1c2dmk2n963/59688901747.pdfIn PDF document text
- https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/20557570728.pdfIn PDF document text
- http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087c4747d1eb---63145979790.pdfIn PDF document text
- http://www.pilartangguh.com/file/fodijibuwetik.pdfIn PDF document text
- http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4b3bd307b---lutaloxijatadef.pdfIn PDF document text
- https://jotelek.hu/files/file/80843193726.pdfIn PDF document text
- http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721cac1765d---16963649934.pdfIn PDF document text
- http://richmore.kr/uploadfile/fckeditor/file/83296538552.pdfIn PDF document text
- http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3dbde6f49e---fexufelixefibogitokulefu.pdfIn PDF document text
- https://fanaf.comarticle_ressources/file/toserujarabotojara.pdfIn PDF document text
- http://defhjdr.friend-match.com/upload/files/32171478239.pdfIn PDF document text
- https://atamergranit.com/userfiles/file/40104350509.pdfIn PDF document text
- https://onlineadda.net/ckfinder/userfiles/files/7953855873.pdfIn PDF document text
- https://fleuriste79.fr/ckfinder/userfiles/files/28021659774.pdfIn PDF document text
- http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160760f576e7b3---belevafakimubosakokogab.pdfIn PDF document text
- http://www.siposferenc.hu/html/logizuwigukimexoroxetad.pdfIn PDF document text
- http://thaidicattery.com/clients/f/f7/f7b4890cfba443994123e46b8078d6bd/File/65100933202.pdfIn PDF document text
- https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0749f3de9---77642510712.pdfIn PDF document text
- 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_off0000ecc4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xECC4	18232 bytes
SHA-256: `a872a99414d367894080d62155503dce9297b87a5f5f14074922a9fcc1a18dc8`
`font_01_sfnt_off00011c1e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11C1E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013435.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13435	10636 bytes
SHA-256: `adbe51953c950aa9a3ff0bd570d5a137155527b4500ac6b32c5989a7147e74f2`

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