PDF malware analysis — malicious · a999a0c9572c2776

MALICIOUS

PDF

89.6 KB Created: 2021-06-25 18:44:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05

MD5: 5dd104f1fbd943f462bba5a33cc42a2b SHA-1: 7dc79d0dc50e5553ac63cd2a2a6071af4b8ea98e SHA-256: a999a0c9572c2776702449f7243d2edb258f07bbd3a884cfb398e2e3e07fdd28

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. The presence of external URIs and the nature of the heuristics strongly suggest the PDF is intended to redirect users to malicious websites, potentially for further exploitation or credential harvesting.

Machine Learning

Nyx PDF Classifier malicious score 0.9937

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://allytemp.ru/uplcv?utm_term=flying+to+mexico PDF link annotation
- http://mashtalkandil.com/userfiles/file/redorer.pdfIn PDF document text
- http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098f57828469---bukekenexigafotodi.pdfIn PDF document text
- http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c4639b3fa---difub.pdfIn PDF document text
- http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075c0c03bbe1---23533429348.pdfIn PDF document text
- https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/603cfe38de29fad09f585ba5f9316bf5/8406186005.pdfIn PDF document text
- http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5cb5131e40---wetukibidiri.pdfIn PDF document text
- http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092fffd5daa2---62498324683.pdfIn PDF document text
- http://nhs1980alumni.com/clients/878257/File/82843587933.pdfIn PDF document text
- http://biosurfest.com/userfiles/files/24312270764.pdfIn PDF document text
- http://k1a.ru/images/files/file/26104886612.pdfIn PDF document text
- https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/d6e55c8c05f4688231e06406f11fb13d/lodig.pdfIn PDF document text
- https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/8b9d7bd11363eba0665f66ee67c8f2d4/tajedotazoduxoj.pdfIn PDF document text
- http://www.cafeinca.com/img/public/contenido/file/57283051072.pdfIn PDF document text
- https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baf9e455ec9---22340670216.pdfIn PDF document text
- http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8416f0a10---taxilazidomiti.pdfIn PDF document text
- https://zahnersatz.pl/userfiles/files/kamupijapikoxesobutozolu.pdfIn PDF document text
- https://paymentor.nl/uploads//file/9260056822.pdfIn PDF document text
- http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9351d2f2e---dolumuj.pdfIn PDF document text
- https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/60566d50666c8df8256e073f7e4a1665/66977907011.pdfIn PDF document text
- https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160892b7fd24b6---52270089333.pdfIn PDF document text
- http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb64d5528b---titux.pdfIn PDF document text
- http://dokumsuzgec.com/userfiles/files/bufet.pdfIn PDF document text
- https://balaji-technology.com/userfiles/file/mifawoz.pdfIn PDF document text
- https://ajitcoatings.com/uploads/dujopujipiw.pdfIn PDF document text
- https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/2klglsc5j460ce8asspmp2duqp/65918663948.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_off0000fead.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFEAD	16860 bytes
SHA-256: `d80dfe754e2e7354d68c0c4475c592cd552ddb0046912744b951de311b7660e3`
`font_01_sfnt_off000129ed.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x129ED	10336 bytes
SHA-256: `91aa25c8570ff1ff6292d8e3c5cfd65dafcadbf5055bda609d3d6977f80a9fe3`
`font_02_sfnt_off0001413a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1413A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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