PDF malware analysis — malicious · 575acf08a2b4e79b

MALICIOUS

PDF

88.5 KB Created: 2021-09-17 03:01:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21

MD5: 01ef3ae863ce80e6fb5a3f822ec978a7 SHA-1: 53c141b48ea667d270f0418dc377aa8fdb76b6a9 SHA-256: 575acf08a2b4e79b4fc0cfc2fcf8b922404330663e4c7c3ea40aa3606a5e8066

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs that point to compromised CMS upload directories and disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, but the presence of multiple external URIs suggests the primary goal is to drive traffic to attacker-controlled infrastructure.

Machine Learning

Nyx PDF Classifier malicious score 0.9922

Heuristics 5

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://allytemp.ru/uplcv?utm_term=temple+run+oz+hack+apk PDF link annotation
- http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c44b2876e---buselaponiv.pdfIn PDF document text
- http://rracc.com/file_media/file_image/file/22506398590.pdfIn PDF document text
- http://tabouligrill.com/ckfinder/userfiles/files/35039689311.pdfIn PDF document text
- http://aggengr.com/uploads/CMS/file/zarowulut.pdfIn PDF document text
- https://conexkarvan.com/cache/fck_files/file/48881437259.pdfIn PDF document text
- http://tuclubcr.com/campannas/file/bedenan.pdfIn PDF document text
- http://ambulanceservice.pl/userfiles/file/magamoxojenisixoju.pdfIn PDF document text
- https://locoffice.ru/userfiles/file/perimurajirivotanibuv.pdfIn PDF document text
- http://agrocare.hu/ckfinder/userfiles/files/99639757181.pdfIn PDF document text
- http://pereplanirovkaoblast.ru/pict/file/ruvarumel.pdfIn PDF document text
- https://marblobathware.ph/app/webroot/img/files/20929649558.pdfIn PDF document text
- https://ntpuvoice.com/ckfinder/userfiles/files/popewefegikusake.pdfIn PDF document text
- https://maymac.info/userfiles/file/zebazide.pdfIn PDF document text
- http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161401bef46219---98609399471.pdfIn PDF document text
- http://laboratoriologos.it/userfiles/files/94886917856.pdfIn PDF document text
- http://xn--3e0b556bhrbowi6undva.com/ckupload/files/sibukidukomabiriberumod.pdfIn PDF document text
- http://premiercontractinginc.com/files/file/kosereba.pdfIn PDF document text
- https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfeb1692a3---6714700019.pdfIn PDF document text
- http://roseeskin.com/userfiles/file/20210917053500.pdfIn PDF document text
- http://purepoem.com/resource/docContentImg/file/2021-09-10/1bfd0eda07a9558d0ccbe66e921b316d.pdfIn PDF document text
- https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/shju49mh61ab12uv29m1fihn3q/59581912629.pdfIn PDF document text
- http://seamacros.com/upload/file/lugativezamawokagulujidep.pdfIn PDF document text
- http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/c1pob9fhhp8hkdkasq9j38t82t/bigezawelodikabazulipadag.pdfIn PDF document text
- https://www.q-jin.ne.jp/ckfinder/userfiles/files/jaxewefu.pdfIn PDF document text
- http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/35927179247.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_off0000db8c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDB8C	20396 bytes
SHA-256: `c5114e2d093e5a8691fc556a559f4b787c3acb529d36c904088f55d563dc1f0a`
`font_01_sfnt_off00010e92.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10E92	16164 bytes
SHA-256: `a0f26d9ec2bc0bbc84dfb8c1a224a49f7f70479ac92e21d726acd811d43f3bd1`
`font_02_sfnt_off00012437.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12437	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off00013c4e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13C4E	10496 bytes
SHA-256: `392e43c3080712fcafcb75ab90f50b41033fff6a452d46e5455350c2ccb4a34f`

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