PDF malware analysis — malicious · 99125d6f2d6efeb8

MALICIOUS

PDF

80.6 KB Created: 2021-09-28 18:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 325a729e3435c343f3d768d51aa279bf SHA-1: 8ee6d6ff14c90832078e1f8a7b802e3f7ef4a4c4 SHA-256: 99125d6f2d6efeb8a8034aa17bb1d6b075eb24fb1309b9ad132983ccb647c157

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as containing a link farm pointing to compromised WordPress uploads and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9938

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://crysiq.ru/uplcv?utm_term=inshot+mod+apk+latest+version PDF link annotation
- http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161316374d4b5d---90658997178.pdfIn PDF document text
- https://www.xyoaa.org/sites/default/files/files/46493075403.pdfIn PDF document text
- https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/8f2100f0c3020ef38816537a7256db4c/83511153031.pdfIn PDF document text
- http://dailymaydemtien.com/userfiles/files/tanipetalugefulufi.pdfIn PDF document text
- http://avvocato-callegaro.it/public/file/fezosugikofanimip.pdfIn PDF document text
- http://michardardillier.com/ckfinder/userfiles/files/72343480692.pdfIn PDF document text
- http://brlairport.com/images/file/romibejaguzisurijadawuk.pdfIn PDF document text
- https://alpasol.e-giant.net/upload/files/92950765481.pdfIn PDF document text
- https://101doctor.com/uploads/ckfiles/files/6150c0a19cc3c.pdfIn PDF document text
- https://samavetpharm.com/userfiles/files/zavupolitumomeboxivelak.pdfIn PDF document text
- https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/ob0v1bdnvhprlr7b200oda8ke8/xedukizadon.pdfIn PDF document text
- http://eko-uklid.com/files/file/96090377847.pdfIn PDF document text
- https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d10360fe4---45333430521.pdfIn PDF document text
- http://plantessentialoil.com/upload/files/gilatajurupuduwinivup.pdfIn PDF document text
- http://hatdesechia.com/storage/ckfinder/files/vuvuneg.pdfIn PDF document text
- https://kamarkosong.com/contents/files/zuwifamesojas.pdfIn PDF document text
- http://thienminhgroup.com/uploads/userfiles/file/simolelenotet.pdfIn PDF document text
- http://chinhsuasolieu.com/media/files/6747728237.pdfIn PDF document text
- https://lexcyberia.com/userfiles/files/40472319631.pdfIn PDF document text
- https://growyourmoney.in/userfiles/files/wemaritadikubeluvo.pdfIn PDF document text
- https://newfrio.com/userfiles/files/10226181818.pdfIn PDF document text
- http://bolt-go77.com/fckeditor/userfiles/file/11143972530.pdfIn PDF document text
- http://mikailang.com/userfiles/file/20210904130909_523459965.pdfIn PDF document text
- http://osayit.com/images/file/taritopozodafawafu.pdfIn PDF document text
- https://shturnev.com/files/foFKED/file/20880279416.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000b9b0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB9B0	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000d1c1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD1C1	16188 bytes
SHA-256: `800554d3d6320da9c8ab21a3ad3d270f40e7a92360d7538c059d647d952d1d34`
`font_02_sfnt_off0000e778.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE778	10768 bytes
SHA-256: `8301178ed0433264ffe734daea3145d388113d8c14836ccbf8cb7f2d29804cdd`
`font_03_sfnt_off00010000.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10000	20208 bytes
SHA-256: `a5995b3ce0b7ba80978352b6b5893676aae56f224fdf8e28fda0af2169ee1333`

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