PDF malware analysis — malicious · 1605b73bab035f65

MALICIOUS

PDF

85.0 KB Created: 2021-09-02 08:04:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: cf7caec8d26dab299bfff8770dba9741 SHA-1: 6d222283992e25aaab495a8b92137647605d7d71 SHA-256: 1605b73bab035f65cdc350323c83ba0911599db8972b920bff9809bb7085db8a

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or redirection attack.

Machine Learning

Nyx PDF Classifier malicious score 0.9919

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://medvor.ru/uplcv?utm_term=the+third+miracle PDF link annotation
- https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c397b1653d1---jeradukefobolupalawela.pdfIn PDF document text
- http://sport-way.ru/img/file/gobeviromonedexotegex.pdfIn PDF document text
- http://globalquestconsulting.com/userfiles/files/vagivumonege.pdfIn PDF document text
- https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/9a88u26vo8iaj0nla8oi59kitt/29206090026.pdfIn PDF document text
- https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160946b02c65f4---40434799690.pdfIn PDF document text
- https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608904a349c92---gikopefufe.pdfIn PDF document text
- https://fier-forjat-valimet.ro/ckfinder/userfiles/files/jodorutarewabaxo.pdfIn PDF document text
- https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160a3335b5d8b6---24451178982.pdfIn PDF document text
- https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/qo6ve9babu3tcf28q07k43h6el/jalavagajefeluxajixuvaw.pdfIn PDF document text
- http://kirilmazbardak.com/userfiles/file/fokasulosezaxu.pdfIn PDF document text
- http://angelescare.com/userfiles/file/12754875380.pdfIn PDF document text
- http://mountcalvary76.com/clients/9/90/9062e1c9f2360b2cedac6e2854879500/File/jowug.pdfIn PDF document text
- https://novinfasteners.com/userfiles/file/16858240259.pdfIn PDF document text
- https://lederstuhlshop.de/ckfinder/userfiles/files/zanazamixetamit.pdfIn PDF document text
- https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/2q6p08h0bqeqkj3gp46nma3hp2/87675894999.pdfIn PDF document text
- https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/579cf38725907774ba4d3229f3fe9a73/fapijawuj.pdfIn PDF document text
- https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/6800668fac59c3d5bff2f774509c25c8/duwiju.pdfIn PDF document text
- https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/aa9c7d7b11c2da569aa6793a8c3b4bb8/21017100062.pdfIn PDF document text
- http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161004162abe67---68557858455.pdfIn PDF document text
- https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079517c80794---wutogujeket.pdfIn PDF document text
- https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/cc10dba63e6e185c38a5a189fcad377b/foxadinesetigewapujorad.pdfIn PDF document text
- http://dexgerm.com/data/file/userfiles/files/38356457839.pdfIn PDF document text
- http://quaretti.it/userfiles/files/dosafepo.pdfIn PDF document text
- http://dilimkebab.com/userfiles/file/jepejepuwoziro.pdfIn PDF document text
- http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1629148000.pdfIn PDF document text
- http://gianniarnaudo.com/userfiles/files/xigepijar.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_off0000e83b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE83B	10204 bytes
SHA-256: `0d07aa8815749cda63bf42d152bed718ee629a537be5581bd446a2d602447c39`
`font_01_sfnt_off0000ff12.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFF12	18016 bytes
SHA-256: `33c1ca12d0ef4898a8c78d5960cf1c4986b3f375ea86eece206ff706b839bf41`
`font_02_sfnt_off00012d86.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12D86	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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