PDF malware analysis — malicious · 90adf5c76064ae82

MALICIOUS

PDF

70.7 KB Created: 2021-09-26 03:23:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23

MD5: b8b89b669dda3110a5b20374ac0f88d4 SHA-1: fa8a4636fe419327fc8b3b4175c73d1aede16c71 SHA-256: 90adf5c76064ae8294679cfc94c83cbb93b134bb3e0aefebe650aa030e45001f

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded URLs point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

Nyx PDF Classifier malicious score 0.9916

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://synerhu.ru/uplcv?utm_term=stress+and+intonation+exercises+pdf PDF link annotation
- http://praguetransfer.com/files/file/feparodaj.pdfIn PDF document text
- http://noahmission.org/dataroom/file/vuruwesadozos.pdfIn PDF document text
- http://titusauto.hu/kepek/file/bogeda.pdfIn PDF document text
- http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kuxosafebiginuputafiposud.pdfIn PDF document text
- http://vino-charlie.cz/userfiles/file/38765485234.pdfIn PDF document text
- https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7c74d1209---61584721531.pdfIn PDF document text
- http://pmrs.ps/userfiles/file/66035501652.pdfIn PDF document text
- http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148e9d676605---xivikusovakaxo.pdfIn PDF document text
- http://precisao.org/files/files/semusalaretekevafov.pdfIn PDF document text
- http://cka-shiba.com/ckfinder/userfiles/files/6416831989.pdfIn PDF document text
- http://phongkhamthienhoa.org/images/files/2510189471.pdfIn PDF document text
- http://viviapalermo.com/userfiles/files/90328534884.pdfIn PDF document text
- http://hftyby.com/upload_fck/file/2021-9-23/20210923011914763264.pdfIn PDF document text
- http://flynewsletter.com/uploads/file/dukugilizukazilelubajileb.pdfIn PDF document text
- http://gillsandgeckos.com/userfiles/file/97336067090.pdfIn PDF document text
- http://forter.vn/hinhanh/file/23681183188.pdfIn PDF document text
- http://studiosantomauro.it/userfiles/files/pujaruwikopejo.pdfIn PDF document text
- https://bistakalikotenetwork.com/userfiles/file/71445311901.pdfIn PDF document text
- http://webbolt.fono.hu/data/editorfile/sadodelumaponeloj.pdfIn PDF document text
- http://dtjxbpzx.com/filespath/files/20210907042614.pdfIn PDF document text
- https://yumasri.com/assets/ckfinder/userfiles/files/52899413793.pdfIn PDF document text
- https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614b416f739eb---pumufumujupimizaw.pdfIn PDF document text
- https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/0eu1a5nobrqv63oe4iqt8vndjp/4242919640.pdfIn PDF document text
- http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xegibavijivopadugitotere.pdfIn PDF document text
- http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612f78dc26427---bolopebakune.pdfIn PDF document text
- https://prestinieurope.ch/userfiles/files/86121040134.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_off0000b535.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB535	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000cd4c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCD4C	10744 bytes
SHA-256: `07c8f11cb3d84e95d21950bec95e59a5de59866c6cc8274559239481cfe29fa2`
`font_02_sfnt_off0000e622.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE622	15136 bytes
SHA-256: `c2716f4cc9fc51492acefdd024e5d77a89c9cafdcfb3b4326e718e44d32ea478`

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