PDF malware analysis — malicious · a650cc57f2938634

MALICIOUS

PDF

83.2 KB Created: 2021-06-25 17:56:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25

MD5: 3f936280a0dc5af60ce3f2c5ebdb5d12 SHA-1: 9e7d2719147d0ca15e8a51517e5b1a8ac52454d4 SHA-256: a650cc57f2938634e44c4836e35faa66f4736fc24072bf674fcb061134eb4b07

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm containing numerous external URIs, many pointing to compromised CMS upload storage or disposable hosting. These links likely serve as lures to phishing sites or malware downloaders.

Machine Learning

Nyx PDF Classifier malicious score 0.9956

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://irlanc.ru/uplcv?utm_term=standard+rated+items PDF link annotation
- https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/376c7158fc2da9d64c161677d078632c/57480920945.pdfIn PDF document text
- https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/f5f9833c6653b0db6f0be9bd877a8326/48871870508.pdfIn PDF document text
- http://come2menorca.com/images/file/xoturatepe.pdfIn PDF document text
- http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e65d826a12---69452741851.pdfIn PDF document text
- https://stopserv.ru/files/file/zesikosuluritepag.pdfIn PDF document text
- http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5c0387dc6d---lazonufugiperojepa.pdfIn PDF document text
- https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea28825a75---fuzimezaretovelojaze.pdfIn PDF document text
- https://stijsr.com/userfiles/file/dubop.pdfIn PDF document text
- http://soepcentrale-dekeyser.be/userfiles/file/rawalejoluzokuroxelotufi.pdfIn PDF document text
- https://aftaplan.com/works/peepsparty/html/upload_files/file/tawafulikasalilap.pdfIn PDF document text
- http://bygreenpure.com/userfiles/file/22719920173.pdfIn PDF document text
- http://easyreturn.store/userfiles/file/3047782819.pdfIn PDF document text
- https://lacecinella.com/writable/public/userfiles/file/kosamubiresurisajujepesuz.pdfIn PDF document text
- https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9305323116---pewebazezumeduvewu.pdfIn PDF document text
- https://asiarsolutions.com/userfiles/file/32716081908.pdfIn PDF document text
- https://avistravel.ro/userfiles/file/88607276443.pdfIn PDF document text
- https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/5a296e1f6757bbf02bfc4b8f3672e3cd/26889404429.pdfIn PDF document text
- http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160930dc6dd84e---37201214705.pdfIn PDF document text
- https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/81b227c6602d29d9dcf115bfe6bfd221/6784774474.pdfIn PDF document text
- https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608744e49152c---91174417635.pdfIn PDF document text
- http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/ssc2h2fl5v3kld8fgihvbjdpm0/koxivajapoposewexi.pdfIn PDF document text
- http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608e38bb237e1---jatolerijosurig.pdfIn PDF document text
- https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/27jjrp5d75pfpbnnlr9svu18a9/7032522043.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_off0000e3f8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE3F8	10320 bytes
SHA-256: `e4ec1a8c34a3844965666ce6f4a97aa748389e210438d44f8c9a21707dfa399f`
`font_01_sfnt_off0000fb2b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFB2B	17064 bytes
SHA-256: `c1b80cead9813d68b5bf7e29bd3366876d6bbe93cb8b5cb04e64de24ceb7e6e0`
`font_02_sfnt_off000127a9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x127A9	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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