PDF malware analysis — malicious · a3142bb28b63ed27

MALICIOUS

PDF

79.7 KB Created: 2021-09-06 12:00:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: eef98c70f3636e07a844e1515e128701 SHA-1: 9a80c482c16d046e144b15095fbbed428c1c71c4 SHA-256: a3142bb28b63ed27709176dee1100d7915d572ea5343173b36d2511ed7df72f5

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs that point to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware distribution. No scripts were extracted, but the extensive use of external links is the primary indicator of malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9917

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://synerhu.ru/uplcv?utm_term=dymo+letratag+personal+label+maker+11944+silver+manual PDF link annotation
- http://www.ondebiz.com/userfiles/file/dilezikalokubaxo.pdfIn PDF document text
- https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/v76remr0nttotdl5gogbgv6l00/disazodimoribifumaselomuv.pdfIn PDF document text
- http://sure2trips.com/bot/ckfinder/uf/files/jakonatomokujilojevit.pdfIn PDF document text
- https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16079bebbe4ec4---61273564069.pdfIn PDF document text
- http://cuanhomkinhtoanthang.com/media/file/85040381919.pdfIn PDF document text
- https://angkortaxiservice.com/userfiles/file/47838150278.pdfIn PDF document text
- https://sunarchegypt.com/userfiles/file/99432540586.pdfIn PDF document text
- https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f303c8459d2---83035697654.pdfIn PDF document text
- https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/56b6915d89b4ac85c6984705f5de202c/takinosawawanepejawa.pdfIn PDF document text
- https://responsible-tourism-alliance.com/content_file/files/takulenozuvupi.pdfIn PDF document text
- https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd61802c2a---61417608329.pdfIn PDF document text
- http://diclenakliyat.com/userfiles/file/rerafal.pdfIn PDF document text
- http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/161168a47372cf---7598584152.pdfIn PDF document text
- http://upsshop.ru/ckfinder/userfiles/files/9351511673.pdfIn PDF document text
- http://thuonghieutoancau.vn/uploads/files/demopita.pdfIn PDF document text
- http://www.look4job.gr/images/_user_na/file/koruvenuwifiguvurozi.pdfIn PDF document text
- https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/5b235046e15b541df97a5f79ceb0f66e/51115245713.pdfIn PDF document text
- https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/5772b661c174286a019f8a265e7a51e2/3018250369.pdfIn PDF document text
- https://chambredhotes-savoie.com/ckfinder/userfiles/files/diwogitixoguzutowena.pdfIn PDF document text
- http://opuspoint.com/ckfinder/userfiles/files/30595991098.pdfIn PDF document text
- https://novamakine.com/upload/ckfinder/files/voxotosawaguguridebobewux.pdfIn PDF document text
- https://classicandcamper.co.uk/wp-content/plugins/super-forms/uploads/php/files/oqmkal2u9fl0cglhp8ma1rnt0d/peveguvevusedobarokibit.pdfIn PDF document text
- https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b93f7d24cf3---70176544070.pdfIn PDF document text
- https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/5aedfe3ff176ac877e3dc6f4e3bbcc06/89626518894.pdfIn PDF document text
- http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/nobivigudositezexaxolu.pdfIn PDF document text
- https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/e13b359d66310c0ceb66f72d7ed0c1da/2279851393.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_off0000cfb5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCFB5	11404 bytes
SHA-256: `62a2f9e1cf6f5f3fc61e9f2e4382851e5efcc1708ef0e273bab56ec6de14e0e1`
`font_01_sfnt_off0000ea7c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEA7C	17708 bytes
SHA-256: `cc9e74a7f5c3f2af2bf872ce6e7a5f28c65250dcb17959cf851679533ec0a227`
`font_02_sfnt_off0001186c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1186C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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