PDF malware analysis — malicious · 4121407a2c85c1ca

MALICIOUS

PDF

94.4 KB Created: 2021-08-08 09:14:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 33befc926fb1237bd55d3c00d617d768 SHA-1: 718adfd5a8ebce99033c5e3f4ef9a1e4e7def331 SHA-256: 4121407a2c85c1ca70f22d8d8fa70a366a82d64e159733944fac8360b46c35ad

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or SEO abuse. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious or compromised sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9914

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://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607683b68d9cd---19904138372.pdf In PDF document text
- http://rocincorporated.com/domain.com/images/dynamic_pages/file/wipomitutenop.pdfIn PDF document text
- https://chokysitohang.com/Uploads/userfiles/files/37890223867.pdfIn PDF document text
- https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1609d037a8e654---bufiguxizopevane.pdfIn PDF document text
- https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/ag4q3k03490kd7a3p2d3r8ras5/85148529672.pdfIn PDF document text
- https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/765bb4506f136ba708cfa1c9cca8aa99/zijuxoza.pdfIn PDF document text
- https://autosaloncenter.com/uploads/file/6077205796.pdfIn PDF document text
- https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f408bc968f1---60014712369.pdfIn PDF document text
- http://gojjang.com/uploads/files/36311482477.pdfIn PDF document text
- http://cintabogor.com/Uploads/userfiles/files/77898266614.pdfIn PDF document text
- https://rcot.org/userfiles/file/sobepisilosewezo.pdfIn PDF document text
- http://darec.sk/files/files/rukif.pdfIn PDF document text
- http://hondatayho.top/img-ngocbao/files/zufufusovivab.pdfIn PDF document text
- http://windmill-bv.com/userfiles/files/nibenegovuninili.pdfIn PDF document text
- http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c84195047---84006707893.pdfIn PDF document text
- http://familiegravesen.dk/ckfinder/userfiles/files/biganatuwojavez.pdfIn PDF document text
- http://catgarner.com/clients/873270/File/folimonizujiralikuva.pdfIn PDF document text
- http://steelfurniturecn.com/d/files/98258433483.pdfIn PDF document text
- http://amexeuro.com/an3_Uploads/file/tekejujabuxajoregewitax.pdfIn PDF document text
- http://baugeraeteverleih.de/benutzerdateien/ketokoxabisari.pdfIn PDF document text
- http://www.abcklima.hu//data/editorfile/duxajudiwepi.pdfIn PDF document text
- https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/68716515bf20307b44b676a4bcabf159/jugokades.pdfIn PDF document text
- https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/k55iqtmodsoa6bp945u7uu67a0/zulekapejiseniwusamura.pdfIn PDF document text
- http://petukmahaaaraj.com/userfiles/file/17136233610.pdfIn PDF document text
- http://entone.es/wp-content/plugins/super-forms/uploads/php/files/f991e83f4f27a0516f08081482e21016/98876518926.pdfIn PDF document text
- http://jrpst.pl/userfiles/file/49581612476.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=caracteristicas+del+mantenimiento+preventivo+a+motores+electricosPDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_007_off00013586.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x13586	17960 bytes
SHA-256: `e401e63fefc0657d4de9f69b416d7fa5254ee92171ec2aecccd50964c76fa1a1`
`font_00_sfnt_off0000f219.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF219	16852 bytes
SHA-256: `f0f7eb96e9cc9b3f16f4b405af594d19262760a70fdde6e1cda3d056b94c26e9`
`font_01_sfnt_off00011cc3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11CC3	10772 bytes
SHA-256: `8afd3a428f2f0fa87ef6b816bafb419368933100ba483652501f1c1217aedb13`
`font_03_sfnt_off000151a4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x151A4	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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