PDF malware analysis — malicious · 63b298d314c29678

MALICIOUS

PDF

77.6 KB Created: 2021-09-06 15:13:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: 4da2bd7a8a0bbe1ed59a25e81350215a SHA-1: 8700311abf196220578a940d0da7312a90f4bf16 SHA-256: 63b298d314c2967828d9b82ac00a880d7513d113110865b0ccb8d4b52df5fbeb

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged by multiple heuristics as malicious, including ClamAV detection and an ML classifier. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to compromised websites. The presence of links pointing to WordPress upload storage and disposable hosting further indicates a malicious intent to distribute further payloads or conduct phishing.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

Heuristics 6

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
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://medvor.ru/uplcv?utm_term=socrates+in+love+kyoichi+katayama+pdf PDF link annotation
- https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa67228ac1a---50458669885.pdfIn PDF document text
- http://felixefontesadvogados.com.br/ckfinder/userfiles/files/dusugufi.pdfIn PDF document text
- http://inbeeldt.nl/userfiles/file/xuzizibiborut.pdfIn PDF document text
- https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0f051e6f5---50040916442.pdfIn PDF document text
- http://gmtshipping.com/attachment/file/12822196057.pdfIn PDF document text
- http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/df610ba41cf6c832ea0df42a3db14109/9566482062.pdfIn PDF document text
- http://profil-metall.de/content/uploads/file/tijanesipap.pdfIn PDF document text
- https://interativacorretora.com/fotosempresa/files/1451261380.pdfIn PDF document text
- https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/bbf5f4e1c641f84ac6f87947555e4d3a/dawafukufobewixaxanuniki.pdfIn PDF document text
- http://jrpst.pl/userfiles/file/70346496432.pdfIn PDF document text
- http://naszymsladem.pl/upload/file/74396095901.pdfIn PDF document text
- http://e-hane.com/files/45229750256.pdfIn PDF document text
- http://chetaomaynganhnhua.com/uploads/files/nupimokebulisetudir.pdfIn PDF document text
- http://deltools.com/userfiles/file/pipevisema.pdfIn PDF document text
- https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9c2de716b---gozijawiperisazulo.pdfIn PDF document text
- http://royalwedding.jp/images/blog//file/resesukuzobetafu.pdfIn PDF document text
- https://lrsinc.co/userfiles/file/79375947135.pdfIn PDF document text
- http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1705f47e83---3929690371.pdfIn PDF document text
- http://www.biosafety.biz/ckfinder/userfiles/files/subosidadu.pdfIn PDF document text
- https://santa.my/images/users/00000000/files/5652658310.pdfIn PDF document text
- http://hattingtoemrerogsnedker.dk/userfiles/file/vodewevimojopuvegu.pdfIn PDF document text
- https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4256457015---37258685436.pdfIn PDF document text
- http://alexanderjamesbackcatalogue.com/userfiles/file/lakikamukugirudebexiwimik.pdfIn PDF document text
- http://tienhasteel.com/app/webroot/upload/files/fabukotuwij.pdfIn PDF document text
- http://kapalishakti.com/ckfinder/userfiles/files/berosaxolasedona.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_off0000c234.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC234	11232 bytes
SHA-256: `f82be433777c53e438ea765106ff9a0446e671123f4a0368c13de643e169abe8`
`font_01_sfnt_off0000dc49.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDC49	19588 bytes
SHA-256: `76965ab72540e36bf3801a7ba58c7ae3f900ea80969dfcaad65d40b51e20eaaa`
`font_02_sfnt_off00010fc7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10FC7	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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