PDF malware analysis — malicious · 644ace9619b425f2

MALICIOUS

PDF

89.6 KB Created: 2021-07-02 06:52:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05

MD5: ef36476fbb93c5c418fbb4cd078c5a34 SHA-1: 9cf3f845f0dcc265bbfb3294c9ba129539704786 SHA-256: 644ace9619b425f259d8b83e2ef46012ec33938693de376bac2f1a22228cb80e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded URLs are consistent with phishing or malware distribution campaigns.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://ninda.vn/userfiles/files/wobipuvoriparigosuwuxo.pdf In PDF document text
- http://bannermaul.com/userData/board/file/90547150853.pdfIn PDF document text
- https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/1716cf8c695be0da02264cd191b5f51b/gajegobivurolanujomiv.pdfIn PDF document text
- https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/204ca786bd7d5e5d1f2eee04b0e77457/gosusaxavaworopiv.pdfIn PDF document text
- http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/d6a759c49be72f428dc12f83b4a190ee/67684748426.pdfIn PDF document text
- http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b122987db1---wubusivugolenigafaxoru.pdfIn PDF document text
- https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/2d0f84f36c2b65a93f15609b100ad9d4/lipoxajofuvagibibotojit.pdfIn PDF document text
- http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160bf58256e198---67561118534.pdfIn PDF document text
- https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05df1af1ab---6182776940.pdfIn PDF document text
- https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/7omcmjaj7mac4ohjon0ablprj6/nemesapupemekuw.pdfIn PDF document text
- https://myveolife.com/wp-content/plugins/super-forms/uploads/php/files/709f095e6cee3701efbe1d2b62a8c9ca/taruzudefizolokadudawif.pdfIn PDF document text
- http://aldo-ins.com/userfiles/file/75066760539.pdfIn PDF document text
- http://statsale.com/data/upload/ck/files/84996296527.pdfIn PDF document text
- https://cowichanseniors.ca/userfiles/file/37249003793.pdfIn PDF document text
- http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be8f17679b8---21980986850.pdfIn PDF document text
- https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe83ccf5ba---surotaz.pdfIn PDF document text
- http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b75e2ca2988---15356271055.pdfIn PDF document text
- http://islandpointfl.com/userimages/21492184963.pdfIn PDF document text
- http://benjamin1908.com/clients/f/f4/f4560e3fe432b95d15e234f900dec36a/File/37268878704.pdfIn PDF document text
- http://paillasse.hu/userfiles/file/25527954389.pdfIn PDF document text
- https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608be5c3a3dad---6893476790.pdfIn PDF document text
- https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/c656b62a875b241ed558b6da5179a199/midezokoxa.pdfIn PDF document text
- https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/ee18e1e2c3621be6e88f341ec5802db4/pirovimavamutukigiw.pdfIn PDF document text
- http://aucoindeshalles.fr/menu/file/79445794184.pdfIn PDF document text
- https://mn-lawfirm.com/box/userfiles/file/tijegoxagefibaxexiz.pdfIn PDF document text
- https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/p9duhs9bdt1cvkbvmrhclsdcq4/lawegunuzebivasoxetav.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=find+engine+size+by+vinPDF 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_off0000fcc4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFCC4	10252 bytes
SHA-256: `48e20531315855a7d8905913b90fc681f38bef963f7026fb9fbe88a5be39ff35`
`font_01_sfnt_off000113af.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x113AF	17408 bytes
SHA-256: `28efb544451f3b97784464bc02de2c2d68e545dbdad998f0a4a59c6267f9c335`
`font_02_sfnt_off0001410d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1410D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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