PDF malware analysis — malicious · 5636356ce8d40e03

MALICIOUS

PDF

78.6 KB Created: 2021-07-26 17:22:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 446dfd9c4ff23b9a9431a718fc15196b SHA-1: 0f88a9644d22081fe57858870a371ff6d7546c24 SHA-256: 5636356ce8d40e03c5d7ddf9e12361d5d8a8b4a77dc9e849bd78dc4b4c7533a7

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including a machine learning classifier and ClamAV, which identified it as a phishing trojan. The document functions as a link farm, hosting numerous PDFs on compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of external URIs and compromised CMS upload links indicates a distribution infrastructure designed to evade detection.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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://melz-feu.ru/upload/waxugaluzepubibe.pdf In PDF document text
- http://malbreil.com/userfiles/file/nexojotuz.pdfIn PDF document text
- https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/88d04e2b4e874b12631642d598e808fd/gapuj.pdfIn PDF document text
- http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160734f7a39986---43782090926.pdfIn PDF document text
- http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b61170a8c59---65763405514.pdfIn PDF document text
- http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160734bf0e0b09---94927156845.pdfIn PDF document text
- https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee24d52f68---1513050348.pdfIn PDF document text
- http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16075e24d5395a---wugup.pdfIn PDF document text
- http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/c9304624536bdebd8ed922cef691e843/jimavekojonubebofafakow.pdfIn PDF document text
- https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/4ad57d946e7d4e614ab501e214496266/demekumurorerafejegenu.pdfIn PDF document text
- https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/9qcp62mcpcmrtp15bo0aoj27s4/46637095373.pdfIn PDF document text
- http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd759ed50e7---56494872349.pdfIn PDF document text
- https://motoquadro.de/userfiles/file/83044829235.pdfIn PDF document text
- http://csc0351.com/userfiles/file/20210703051711_lol81d.pdfIn PDF document text
- http://madmojo.com/fckupload/file/26705626408.pdfIn PDF document text
- http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9dc200a3ed---23601891584.pdfIn PDF document text
- https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/b713069d0a80756064db4783402bb8c4/60675792706.pdfIn PDF document text
- https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/90d292f10d98de89d8279e6fe14c4b79/69386113680.pdfIn PDF document text
- http://elesud.it/img_pagine/file/podavaninukufojebomu.pdfIn PDF document text
- http://evergladesharvesting.com/ckfinder/userfiles/files/sitojafinizulamamuleze.pdfIn PDF document text
- https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0b4cb0b13---85139594755.pdfIn PDF document text
- http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160d2eefd740fa---pazijaku.pdfIn PDF document text
- https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160d82eaed97e3---94988650281.pdfIn PDF document text
- https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/8d12c7e7214ea3c026f2d07a2f86adf5/vuwibenubixusalesug.pdfIn PDF document text
- https://bajrahrs.com/userfiles/file/11636910250.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=enlace+ionico+y+covalente+ejerciciosPDF 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_off0000cece.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCECE	10516 bytes
SHA-256: `36188ebab88925b1debdc31c49befdd5a7aef24611d5d0d5cfe1780d2c90bb67`
`font_01_sfnt_off0000e6d7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE6D7	17312 bytes
SHA-256: `bdc0d65c4462be564de802f20069b44aa8d046aebc5624882a1fce48c09ffb7e`
`font_02_sfnt_off000112fa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x112FA	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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