PDF malware analysis — malicious · 4477b31f77662109

MALICIOUS

PDF

86.3 KB Created: 2021-07-27 06:41:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21

MD5: 86f8a76df9a0112d1e3ed6140fc9f0b4 SHA-1: 63a691b32eadb7aaec4a964c9bee77c8b357052d SHA-256: 4477b31f77662109aad908ae7ad574c2455b71471d4b001527d777b6c8a7a35a

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links pointing to compromised websites, suggesting it's part of a link farm designed to redirect users to malicious content. The primary attack pattern involves exploiting user trust through a malicious document, likely delivered via spearphishing.

Machine Learning

Nyx PDF Classifier malicious score 0.9912

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 http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/54c6c555d24b8163d4134490de473e34/4362066791.pdf In PDF document text
- http://naphotelbangkok.com/userfiles/files/67584255483.pdfIn PDF document text
- http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160878af6e88fd---xuzalisigixunisob.pdfIn PDF document text
- https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/ebcdf57f7580f0e8012b2df5c35573fb/20817399982.pdfIn PDF document text
- http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c19855020---31759337528.pdfIn PDF document text
- https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/p6p2t0i1b26jps5j8rb04ngsrq/39355846770.pdfIn PDF document text
- http://e-photo.lv/ckfinder/userfiles/files/58978045350.pdfIn PDF document text
- http://artecgroupservices.com/imagenes/file/zewarozuzewitafawefedexi.pdfIn PDF document text
- https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/05f0eba0b94a664dc721101dde35f04b/83636991301.pdfIn PDF document text
- https://alixdemassy.fr/userfiles/file/5332268851.pdfIn PDF document text
- https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4ed96d042---vuwaxirozuxevat.pdfIn PDF document text
- https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/6e1afe3f8d675cbba7e1e24919f9feb9/36887146056.pdfIn PDF document text
- https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/tudelerajolavo.pdfIn PDF document text
- http://www.alex-vasilkov.ru/images/wisdom/file/judit.pdfIn PDF document text
- http://blueyee.com/upload/file/211523103365.pdfIn PDF document text
- http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0d684dddc1---61435705058.pdfIn PDF document text
- http://photo-preiss.com/upload_files/files/5609650661.pdfIn PDF document text
- http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaaeb31b719---poriturufaruvapikepo.pdfIn PDF document text
- https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/fd178651b9ba6561bd41b74ed2a0f457/59037557102.pdfIn PDF document text
- https://abofahed.com/userfiles/file/98985539581.pdfIn PDF document text
- https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/si7prln1ja1qor3u11oef57vc3/wujidegevit.pdfIn PDF document text
- https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/cc58b75b6bef97bd2131a4e9eb3b80e6/96742301919.pdfIn PDF document text
- http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609b254298ca7---vefugewisunefote.pdfIn PDF document text
- http://angelescare.com/userfiles/file/10743552005.pdfIn PDF document text
- https://zenkenmoshi.info/images/files/file/rafalut.pdfIn PDF document text
- https://bluetact.com/locktactyuma/userfiles/file/16055436327.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=the+obsession+nora+roberts+synopsisPDF 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_off0000ef03.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEF03	17136 bytes
SHA-256: `5ca9f1f1d2284a5f236c6aed99eaa416c31dffa5f406a54837c58d2a1ca49e39`
`font_01_sfnt_off00011b6d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11B6D	10520 bytes
SHA-256: `f7cba537a2d002f67b002e812b021860bdd057d214f0b1ee0631648efe0fe6e2`
`font_02_sfnt_off00013329.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13329	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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