PDF malware analysis — malicious · 4257b50cd99a286c

MALICIOUS

PDF

82.9 KB Created: 2021-09-06 01:48:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-15

MD5: b70f59ff1560ff2c3ff64df9db117aef SHA-1: d4f40f6ab112430b119dcffb3e6260593e9fd149 SHA-256: 4257b50cd99a286c759f507ff9ac3728ebb50eb887856fc4949bc7865b64f36b

156 Risk Score

Machine Learning

Nyx PDF Classifier malicious score 0.9977

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://fizjoactiv.eu/Upload/file/fijogapu.pdf In PDF document text
- https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/26bd003edc6ee9fb523d55603d3ee462/75983504486.pdfIn PDF document text
- http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b3779b14b---59312215894.pdfIn PDF document text
- https://majorsagilekvaros.hu/uploads/file/16111944135.pdfIn PDF document text
- http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fe2a5343fcd---47853643033.pdfIn PDF document text
- https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/r4ioekvhsmdsj2q4pt1snmpusc/35517031522.pdfIn PDF document text
- https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/9c4ca46da54e1e8a929f8ecfa1094559/pumasuwegagu.pdfIn PDF document text
- http://leaders-adv.net/userfiles/file/bipuzosura.pdfIn PDF document text
- http://www.allatpatikapecs.hu/images/file/wowupugajoponetebupama.pdfIn PDF document text
- https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/e117111f9a80e33c6a96d85f1f93b786/bozewene.pdfIn PDF document text
- https://medosojewellery.com/userfiles/files/52937021884.pdfIn PDF document text
- https://mamo-tato.ro/userfiles/file/91633385961.pdfIn PDF document text
- http://93564497.com/userfiles/5938679544.pdfIn PDF document text
- https://rubyyadav.com/nbloom/fckuploads/file/webal.pdfIn PDF document text
- http://beijingxinzhi.com/userfiles/file/20210801090005_1403592118.pdfIn PDF document text
- http://www.chp.pl/ckfinder/userfiles/files/62258801472.pdfIn PDF document text
- http://barahi.com/assets/userfiles/files/68859267663.pdfIn PDF document text
- http://freewest.at/98937447959.pdfIn PDF document text
- https://landatur.com/files/galeria/files/gaxowikogisibuvudugedevu.pdfIn PDF document text
- http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/buzaxezo.pdfIn PDF document text
- http://webhenevents.com/clients/868374/File/81823655301.pdfIn PDF document text
- https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844e722dc2c---gimuxuwuwujuti.pdfIn PDF document text
- https://vyrukrc.lt/userfiles/file/bujanexonowupedelisoj.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=anatomia+de+la+tiroides+y+paratiroides+pdfPDF 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_off0000e02e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE02E	17564 bytes
SHA-256: `88a89f219c9ebf108e8b4951d5208b3e317f442e6274d70500575f9006758a1a`
`font_01_sfnt_off00010c98.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10C98	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000124af.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x124AF	10752 bytes
SHA-256: `51420bb784a4add893797039f71cb01d7b2d2c2f9cda4d4f6c2a343199a27140`

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