PDF malware analysis — malicious · 85dfd2c4680f80f1

MALICIOUS

PDF

75.7 KB Created: 2021-09-22 22:52:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: d70b22d4e9239d7f4be867224c6d574c SHA-1: 959f499c826f5b902a2a05994c8c60ada0b3f143 SHA-256: 85dfd2c4680f80f16f87933d5221286c20e915ba4213e7768764455922e6560e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

Nyx PDF Classifier malicious score 0.9908

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://wastran.ru/uplcv?utm_term=x+construction+mod+apk PDF link annotation
- http://naim.naparts.com/images/fck/file/38736909965.pdfIn PDF document text
- https://matao.ro/app/webroot/files/userfiles/files/16981186743.pdfIn PDF document text
- https://marcvandewiele.com/userfiles/file/46344334303.pdfIn PDF document text
- http://www.perchegouet.com/ckfinder/userfiles/files/48450612383.pdfIn PDF document text
- http://senseoftourism.dk/userfiles/file/rojaseduxudalekidup.pdfIn PDF document text
- http://jiangsutravel.kr/userfiles/files/20210920_124233.pdfIn PDF document text
- http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161327d601cec3---39142205496.pdfIn PDF document text
- https://xn--hjrnskadeakademien-mtb.se/userfiles/file/68337882995.pdfIn PDF document text
- https://eksiliotomotiv.com/upload/ckfinder/files/futadodige.pdfIn PDF document text
- https://angkalaris.com/contents/files/dusedadijupematugod.pdfIn PDF document text
- https://iringmalaysia.com/ckfinder/userfiles/files/19767093538.pdfIn PDF document text
- https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/ropizinuxijifozawox.pdfIn PDF document text
- https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/57b7032c8a429635ce127beb20a34ce9/89678999562.pdfIn PDF document text
- https://avflash.nl/upload/files/feribusipokusexevumod.pdfIn PDF document text
- http://tourister.kr/userfiles/file/80385414047.pdfIn PDF document text
- https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/39131155900.pdfIn PDF document text
- http://fbrasil.com/userfiles/file///fulos.pdfIn PDF document text
- http://parentini.it/userfiles/files/lobujotulixulotarix.pdfIn PDF document text
- http://tantusmarina.com/UserFiles/file/1784915365.pdfIn PDF document text
- http://dallapietamarchisio.it/userfiles/files/liropokares.pdfIn PDF document text
- https://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/nokajodevo.pdfIn PDF document text
- http://sunnyten.net/userData/board/file/38237364119.pdfIn PDF document text
- https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/c614d8f3e1718ecd0917c78abfdebc98/31663641882.pdfIn PDF document text
- http://logiccpacma.com/ckfinder/userfiles/files/46916726406.pdfIn PDF document text
- https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/44986891030.pdfIn PDF document text
- http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614770d86dbbc---sasoresawa.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_off0000c324.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC324	10696 bytes
SHA-256: `730ebb8d3059f60b07eb4226d701b51ea5adeba425b0b8bbf5f21e812245e79e`
`font_01_sfnt_off0000dbb3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDBB3	17536 bytes
SHA-256: `a1c15c3db3fabcafe29c9135acdcb350395d3ce701b560f5d95672710a131a0d`
`font_02_sfnt_off000108d5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x108D5	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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