PDF malware analysis — malicious · 863364f2af73906b

MALICIOUS

PDF

87.2 KB Created: 2021-06-28 16:15:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17

MD5: c2c40483e4a957609d049d9d63ca6421 SHA-1: a8a27b9d76354b717cff7b070d8e2cb059ad7a3e SHA-256: 863364f2af73906bd1a126a2fc733075d035d6acc98b9cf0b0e1f32b82f3640b

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous links pointing to potentially compromised websites and disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF designed for initial access via phishing.

Machine Learning

Nyx PDF Classifier malicious score 0.9942

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 https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/q8tbq21dcmhpa8nlubke6qfef8/diwulekawuvupop.pdf In PDF document text
- http://volamtuyetthe.com/userfiles/file/gokurejudodolupux.pdfIn PDF document text
- http://agcslohian.com/userfiles/file/55910474650.pdfIn PDF document text
- https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d402cdeae3---demolalitigoxawelimov.pdfIn PDF document text
- http://fruitvita.com/files/files/gexemuvizi.pdfIn PDF document text
- http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06d16ba727---89764321109.pdfIn PDF document text
- http://alnadaoil.com/userfiles/file/94733272727.pdfIn PDF document text
- http://hoaisonland.vn/upload/files/31431511208.pdfIn PDF document text
- http://humanitool.ru/userfiles/file/90153168448.pdfIn PDF document text
- https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c568a588e50---tagikasari.pdfIn PDF document text
- http://ingpiazza.eu/userfiles/files/24586427344.pdfIn PDF document text
- http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608570e08bfaf---xigetokitisisogemoduf.pdfIn PDF document text
- https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bb3fa8974---rokoloxar.pdfIn PDF document text
- http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700e1fea7cd---28861990145.pdfIn PDF document text
- http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb7534ef9c---dokilekulovado.pdfIn PDF document text
- https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/3fa546b93400619c74fce504f2c2143b/18146793800.pdfIn PDF document text
- http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609809604bf9a---30447127743.pdfIn PDF document text
- https://maplesservice.com/wp-content/plugins/super-forms/uploads/php/files/039f0754e64e1ae2e0672d1c262ce8a6/pixobeburig.pdfIn PDF document text
- https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/l817gr594k8aaoo71okgsto3ei/75898002480.pdfIn PDF document text
- https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/3bbda6dc9773cb1808cafef15b5077da/71641950895.pdfIn PDF document text
- https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/fiiav6uhe1pgj77tvfsvttgsrq/55237311053.pdfIn PDF document text
- https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071cc835ec80---91316984652.pdfIn PDF document text
- http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0fa21284a5---95009512284.pdfIn PDF document text
- https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/8882a71d0651a32ac1ef25f74892e502/papekix.pdfIn PDF document text
- http://aquatrustfina.com/userfiles/file/dasonumasasopovo.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=grindal+worms+for+betta+fryPDF 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_off0000f209.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF209	16352 bytes
SHA-256: `03980517df5d15f8335e549b458b3bf957b51240e8de6a888b99969ce5860a2c`
`font_01_sfnt_off00011c7a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11C7A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013491.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13491	10896 bytes
SHA-256: `ef7dcbae2c404caebdea4b7327ee3a4423e3e4a3f98da7bb28ede14cceacd43a`

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