PDF malware analysis — malicious · 2cb6932cbf1f7059

MALICIOUS

PDF

103.4 KB Created: 2021-07-31 11:54:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23

MD5: 745565b91fdbd823eaa365953fa6ac8d SHA-1: 565a4aed54b46e7a375d3128315c86520eaa9e7a SHA-256: 2cb6932cbf1f705931a5d600b6e909daebabd6014e206099f4a08a5e1f6f8ba1

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm for SEO manipulation or to host further malicious content. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the presence of numerous URLs suggests a phishing or content-luring attack vector.

Machine Learning

Nyx PDF Classifier malicious score 0.9898

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://nomylo.ru/uplcv?utm_term=battlefield+5+freezes+pc PDF link annotation
- https://vibangnhadat.com/uploads/files/62352592935.pdfIn PDF document text
- https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/882f876f97e4a058ef95a47b0722b085/94492507385.pdfIn PDF document text
- http://baschin-heizung.com/meineBilderAlbertGrundschule/file/sagavoxexobizi.pdfIn PDF document text
- https://htchninc.com/d/files/wodevenelata.pdfIn PDF document text
- http://stagnesreunion.com/clients/e/ed/ed16748122b3ff8ec97113314e0446c4/File/87144896392.pdfIn PDF document text
- http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c94d3d6e512---tepatufaverivixinosezali.pdfIn PDF document text
- https://bem-sa.com/img/file/25569155814.pdfIn PDF document text
- https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab939d08c7f---72155740056.pdfIn PDF document text
- http://camwater.org/media/files/58150436684.pdfIn PDF document text
- https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/8929236580.pdfIn PDF document text
- http://glenbrooksouth1970.com/clients/1/17/17fc1bd13d5538a69f39d58c869d2fc5/File/34563543997.pdfIn PDF document text
- https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/dq94e3ca6471u2p0p6sh29q0qo/8017112664.pdfIn PDF document text
- http://wadirumshootingstars.com/userfiles/file///selirigisovovini.pdfIn PDF document text
- https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/a36irmn5q8muljcq4vligf9vnv/69633540034.pdfIn PDF document text
- http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16074caebeb1e2---34911550364.pdfIn PDF document text
- https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c0573a5df---wopar.pdfIn PDF document text
- http://mdc.ir/ckfinder/userfiles/files/junomofel.pdfIn PDF document text
- https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a5f29e8d3---mitafubova.pdfIn PDF document text
- https://basisnomor.com/contents//files/23917495505.pdfIn PDF document text
- http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a05a8a5a2cb---wapawufatazen.pdfIn PDF document text
- http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607291c8099b0---5692488848.pdfIn PDF document text
- http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160898f1a66a08---95451345707.pdfIn PDF document text
- https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16081a0c963fb3---vewovinujewa.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_off000114c4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x114C4	16244 bytes
SHA-256: `09de60c0dc27f78b13b58c89485f54eda6850e2abbf0aa200acbbeb28e7b49e3`
`font_01_sfnt_off00012acb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12ACB	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000142e2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x142E2	10636 bytes
SHA-256: `e838dbe13bc0600ba09ad9722beb9ea0ddb442bc687589aef3323ebe8b3cc112`
`font_03_sfnt_off00015b6f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15B6F	19220 bytes
SHA-256: `4798e8c5e5009777ec125faf332356e0825ace140a75a7c3448b9322c4b15fa2`

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