PDF malware analysis — malicious · 87ed60f7dfc88b40

MALICIOUS

PDF

70.8 KB Created: 2021-09-25 19:36:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: db27e7ca4fa3e708eb8926c6f6ace646 SHA-1: 93cee5fed859e92004ed47ab1f71b1784b532d77 SHA-256: 87ed60f7dfc88b40aa0f59f9c623fc6e15193d441e6c1f515fa162f80e0611a0

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a PDF link farm. It contains numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly indicate a phishing or malware distribution vector, likely initiated via spearphishing.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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://huntic.ru/uplcv?utm_term=change+button+function+android PDF link annotation
- http://bbpcosmetics.com/admin/upFiles/2021-9/file/majupuvaguvum.pdfIn PDF document text
- https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161422f0589e73---nonasuvujojoz.pdfIn PDF document text
- https://thokhoavietnam.com/upload/files/46467487971.pdfIn PDF document text
- http://mevlanaasm.com/resimler/files/16719436888.pdfIn PDF document text
- https://razredna-nastava.net/files/benexavelivitoke.pdfIn PDF document text
- https://bestrecycledautoparts.net/images_i/file/39652276391.pdfIn PDF document text
- http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/fesojazobiwulasi.pdfIn PDF document text
- http://lycee-elm.org/userfiles/file/tefibuboro.pdfIn PDF document text
- http://stavebnevyrobky.sk/www/upload/files/wivowomigivugesikekadano.pdfIn PDF document text
- http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161499258aa632---66641612601.pdfIn PDF document text
- http://aesg2edcv.handylover.com/upload/files/83137737180.pdfIn PDF document text
- http://nicolalazzarotto.com/userfiles/files/zewaxewonutunedagin.pdfIn PDF document text
- http://gz-theoutfit.com/UploadFiles/FCKeditor/20210902072154.pdfIn PDF document text
- https://tonymusic.se/UserFiles/files/sezure.pdfIn PDF document text
- http://herium.net/FileData/ckfinder/files/20210916_44D72A11CA144938.pdfIn PDF document text
- https://theipbuzz.com/images/file/14707806288.pdfIn PDF document text
- https://master.plus/wp-content/plugins/super-forms/uploads/php/files/faa193dcbc89ca1f7bf1a7e03e6a9d9a/gajerukelatakosapabureb.pdfIn PDF document text
- http://issaproject.com/app/views/panel/ckfinder/userfiles/files/zikodez.pdfIn PDF document text
- http://architettomontanino.eu/userfiles/files/77332342606.pdfIn PDF document text
- http://martom24.pl/martom/userfiles/file/13571142007.pdfIn PDF document text
- http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614b2a5315d4b---64321944386.pdfIn PDF document text
- https://etevent.itweald.com/uploads/files/614c6c2524a47.pdfIn PDF document text
- http://b40555.handyfriendship.com/upload/files/sigoxolevomitubur.pdfIn PDF document text
- http://safarang.com/basefile/files/karokuxuvawodivapobakuki.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_off0000b462.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB462	15832 bytes
SHA-256: `e96d1e987dc1bd4fe4a7d3e597e0ae747d9af3a3f1c756d336b829aad921fcf0`
`font_01_sfnt_off0000dc9e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDC9E	10812 bytes
SHA-256: `c3bf6f599e2f36253628c357a0b68c1ca7168492335db5145eca5763c7cb4bc5`
`font_02_sfnt_off0000f54d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF54D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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