PDF malware analysis — malicious · a46c41c8f477cd27

MALICIOUS

PDF

73.6 KB Created: 2021-09-09 20:34:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31

MD5: 67304ee67e8e2cfd9385f461a21c861d SHA-1: ebc64d04d6ebbd69d470173ba8ab111c484ed6f6 SHA-256: a46c41c8f477cd27ceda4b7608a00c22a9690dfde5883709afc8058991bbd000

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous links pointing to compromised WordPress sites, indicating it functions as a link farm. These links likely lead to further malicious content or phishing attempts. The ClamAV detection and ML classifier strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

Nyx PDF Classifier malicious score 0.9840

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://catamma.ru/uplcv?utm_term=two+letter+words+beginning+with+g PDF link annotation
- http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613772bbbd314---tuwezobobojaxagusebe.pdfIn PDF document text
- https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341467edf1f---22783189260.pdfIn PDF document text
- http://longarmquiltacademy.com/fckeditor/userfiles/file/dapaguziwusutuxoluki.pdfIn PDF document text
- http://newmob.it/userfiles/files/43174594552.pdfIn PDF document text
- http://liebherr-tr.com/userfiles/file/90464858640.pdfIn PDF document text
- https://a-metal.e-giant.net/archive/file/files/32300878950.pdfIn PDF document text
- http://xn--hh0b97d8is16e.com/userData/board/file/97515616337.pdfIn PDF document text
- http://creatinglifeoptions.com/userfiles/files/keretumexokawedegod.pdfIn PDF document text
- http://ototavandosemesi.com/resimler/file/waris.pdfIn PDF document text
- https://euroialinsol.ro/userfiles/file/24017674744.pdfIn PDF document text
- http://laiksmodalux.lt/app/webroot/uploads/userfiles/files/pajufozejivitu.pdfIn PDF document text
- https://rasathantrananotech.com/ckfinder/userfiles/files/dukuwupuram.pdfIn PDF document text
- http://antoniolescio.net/userfiles/files/30065190332.pdfIn PDF document text
- https://noursportevents.com/wheelmarine/userfiles/file/5939279985.pdfIn PDF document text
- https://www.colline-eternelle.com/ckfinder/userfiles/files/51034533216.pdfIn PDF document text
- https://jodhpurtravels.com/nbloom/fckuploads/file/mimegifuxivulafonut.pdfIn PDF document text
- http://inercial.es/uploads/files/62953398822.pdfIn PDF document text
- http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161331b5af1f2d---wixotaturebirajeworom.pdfIn PDF document text
- http://quesnelfoundation.ca/userfiles/file/1575512435.pdfIn PDF document text
- http://seasonsblinds.com/uploads/ckfinder/userfiles/files/51140505854.pdfIn PDF document text
- https://motty-etai-sharon.com/files/files/nexupojiretubepe.pdfIn PDF document text
- https://fratellifurloni.it/file/14542309550.pdfIn PDF document text
- http://marjoleintje.nl/include/userfiles/99046575820.pdfIn PDF document text
- https://aymexco.eu/ckfinder/userfiles/files/mogozafuturagime.pdfIn PDF document text
- http://vitrine-prof.com/files/lisadezirafunepovosinez.pdfIn PDF document text
- https://meganimal.pt/site/upload/file/sokirezik.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_off0000bb7f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBB7F	17384 bytes
SHA-256: `24a43bfad32a2e503851bc3b391adeac31d9586c9a4e04c54700d07a35e8dc65`
`font_01_sfnt_off0000e8d4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE8D4	10556 bytes
SHA-256: `80af41012200a7a94d499d338ee60866f10f1e426c9f7a3d71d70743c56c817e`
`font_02_sfnt_off000100a4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x100A4	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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