PDF malware analysis — malicious · 152cbfa8b64d84f7

MALICIOUS

PDF

89.4 KB Created: 2021-07-01 17:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15

MD5: 842dabf549d147853b9bef7bfc046c88 SHA-1: b93021d001c72d2bb65fa4ff58aedf3b99b85b90 SHA-256: 152cbfa8b64d84f704f1ac8a2e43abcdef2b007b4778cfe8c515fc1a0980ed23

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to various websites, many of which appear to be compromised WordPress installations. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting an attempt to obscure the true destination or purpose of the links. The presence of external URIs and link farms strongly suggests this document is designed to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9822

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://infrive.ru/uplcv?utm_term=viking+war+of+clans+achievement+guide PDF link annotation
- https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/7973b54dbce046e0ef21ee35ed5d0dee/rusetarenoxonofilebor.pdfIn PDF document text
- https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/c2c045d63c498df3a5b3fed3382af6ae/1585975924.pdfIn PDF document text
- https://bestofbucerias.com/upload/file/74696032759.pdfIn PDF document text
- http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/b918602920deb6b1be20025f2e358c9b/nitulakadixererob.pdfIn PDF document text
- https://master.plus/wp-content/plugins/super-forms/uploads/php/files/662e676df530be3b444d30d080cd5e5f/4708176388.pdfIn PDF document text
- http://udokutscher.de/gfx/userfiles/files/47899778879.pdfIn PDF document text
- https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089655b4e210---wajukilupirugomanezob.pdfIn PDF document text
- https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbc6c7ebf7---pekebanajomi.pdfIn PDF document text
- https://zlato-eu.sk/upload/files/daruromomupugexavixidod.pdfIn PDF document text
- https://pendekaremas.com/contents//files/gazovipixelukaz.pdfIn PDF document text
- http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080e2c5c1238---66397970813.pdfIn PDF document text
- https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/c496239ba9f015d6bf58dbfcdad43013/jipejudal.pdfIn PDF document text
- http://satakantaresort.com/user_img/files/polozolilevijojixeroxi.pdfIn PDF document text
- https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/v1399764brv44p78999v6d0773/gelomutusukelo.pdfIn PDF document text
- https://ajitcoatings.com/uploads/kepijaso.pdfIn PDF document text
- http://fitnessklub-impuls.pl/uploads/assets/file/99136441762.pdfIn PDF document text
- https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/9366d580b548a9f3d8ad37684d112ed7/lawewufutogofufisikipid.pdfIn PDF document text
- https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823a615981b---texasinasutitaxedibifub.pdfIn PDF document text
- https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/6f288578218f98e38e61914bd7e3266d/66568454887.pdfIn PDF document text
- https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/241320f9ab71508cb362b5b478bf5a38/sixoxeka.pdfIn PDF document text
- http://haithuanphat.com/uploads/files/5049205300.pdfIn PDF document text
- http://crmrealty360degree.in/userfiles/file/zosejatobobun.pdfIn PDF document text
- http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9089653c14---goximojitewozu.pdfIn PDF document text
- https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4830496f4---35313544020.pdfIn PDF document text
- http://holidayinntorino.com/userfiles/files/61026551906.pdfIn PDF document text
- https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/6b5a89697f8921ec2982d40e674b1754/77441740066.pdfIn PDF document text
- https://lapdonline.org/file/xorurijofe.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_off0000f5ec.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF5EC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010e03.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10E03	11236 bytes
SHA-256: `225c3bdffa8957a880769f2445c0e3c6fbe44c366f0e510e6203eaae80826e38`
`font_02_sfnt_off0001280c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1280C	18708 bytes
SHA-256: `8276f6d4992925d0c5a0af65116f1a02bad2397697fd914d7133315b68c16b95`

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