PDF malware analysis — malicious · c89a3f11a0ed87b5

MALICIOUS

PDF

82.7 KB Created: 2021-09-08 21:53:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: acdea94775baf81f431b54f356d6fb90 SHA-1: 3875dfdda8d87966126e5a60dc1f0951bf462838 SHA-256: c89a3f11a0ed87b5320fc902686da82f487270bb1e7b625e6d06eaa41dfda6bd

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with several URLs pointing to compromised or potentially disposable hosting. One URL, in particular, is hosted on a compromised WordPress upload directory, suggesting an attempt to distribute further malicious content or phishing pages.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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 http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94159726484.pdf In PDF document text
- http://www.rafaellucenaehijos.com/ckfinder/userfiles/files/89249201146.pdfIn PDF document text
- https://dbmotorbrokers.com/userfiles/file/15547962156.pdfIn PDF document text
- http://zonweringbelgie.be/ckfinder/userfiles/files/99389766161.pdfIn PDF document text
- http://intrinhgia.com/admin/webroot/upload/image/files/24684579465.pdfIn PDF document text
- http://eatoceanic.iorderfoods.com/uploads/files/67849622239.pdfIn PDF document text
- http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613172052e450---kejuletilad.pdfIn PDF document text
- http://thaide.org/userfiles/file/mujigarapil.pdfIn PDF document text
- https://bahamianbrewery.com/ckfinder/userfiles/files/binakaxulepusazusuwagujoz.pdfIn PDF document text
- https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/e29fc3e50a5413f8d090535e5128faac/zitodovezix.pdfIn PDF document text
- http://studiogallerani.it/userfiles/files/44110227360.pdfIn PDF document text
- https://aglogistics-bo.net/userfiles/file/ranasodigimov.pdfIn PDF document text
- https://spyboarcams.com/files/riguwoto.pdfIn PDF document text
- https://epagneuls-bretons.fr/caningest/images/file/jamedakapir.pdfIn PDF document text
- http://geometrarontani.it/userfiles/files/3105072439.pdfIn PDF document text
- http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/teranowapimi.pdfIn PDF document text
- http://laboratorioshamalab.com/userfiles/file/92225861317.pdfIn PDF document text
- http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613532e9eba8a---wezanufigum.pdfIn PDF document text
- http://sous-mama.org/userfiles/file/11637383040.pdfIn PDF document text
- https://trinityautorepairs.com/uploads/files/61191949663.pdfIn PDF document text
- http://metapolar.hu/tmp/zarukunadav.pdfIn PDF document text
- http://ngocphuocjsc.com/public/default/ckeditor/files/33715453425.pdfIn PDF document text
- http://avvocatoandreabruschi.it/userfiles/files/jenusajoz.pdfIn PDF document text
- http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef2549e77b---57472495304.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=my+talking+tom+mod+apk+unlimited+coinsPDF link annotation
- 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_off0000d694.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD694	20316 bytes
SHA-256: `28a30a889b07a392ed6a16e6aee11eb9b924cb79409933ab194a0681093f08c0`
`font_01_sfnt_off00010b47.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10B47	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001235e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1235E	11056 bytes
SHA-256: `22221d5b869f07cfaf44245b66c0e0d7bccd6059a6eaca6c45b8a3509918ce8f`

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