PDF malware analysis — malicious · cef6d0688187685e

MALICIOUS

PDF

93.4 KB Created: 2021-09-21 05:37:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 7fd31f3bba6b83856ea7bb66ecc849d7 SHA-1: 3f294e3f20de3dc0fe5e66f36528b31f70133555 SHA-256: cef6d0688187685ea21b0ed751b92997a34d6b4e743dae970fcbc3370b88d514

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to external malicious content, likely for phishing or malware distribution, aligning with spearphishing attachment tactics.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

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://karatenarrewarren.com.au/ckfinder/userfiles/files/10775185618.pdf In PDF document text
- https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/d457b3cb41cab54e525d935277fcbae1/dalajegiwuwabuboxutoxa.pdfIn PDF document text
- http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/161422687e7f7c---susotefefezigupiji.pdfIn PDF document text
- http://heatexchangersolution.com/upload_fck/file/2021-9-15/20210915171357265518.pdfIn PDF document text
- http://geoplan.su/userfiles/file/babolegamuledutofijufubus.pdfIn PDF document text
- http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/solirofod.pdfIn PDF document text
- https://beaszemin.com/files/21538140251.pdfIn PDF document text
- https://ud-hobby.com/images/Upload/file/tudujajinopaj.pdfIn PDF document text
- http://scpt.it/userfiles/files/98209077085.pdfIn PDF document text
- http://csc-021.com/userfiles/file/20210909053704_a2h6ym.pdfIn PDF document text
- https://soi.icami.mx/ckfinder/userfiles/files/fodasepovegabilesoxazufed.pdfIn PDF document text
- http://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/korovotexigupe.pdfIn PDF document text
- http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/40484290016.pdfIn PDF document text
- http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137fd7799c28---diwasupogoxifuzekimomi.pdfIn PDF document text
- https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/7588ad9ab1c77243e1963fb93bb75e96/18001544009.pdfIn PDF document text
- http://iltorg.ru/upload/file/49935082490.pdfIn PDF document text
- https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/gbq745k608hqndprd5i4h6ndo1/44738719956.pdfIn PDF document text
- http://anaminfo.com/attachfile/file/mixaxijesezipote.pdfIn PDF document text
- http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/sokugelivukezovited.pdfIn PDF document text
- https://svezadjecu.me/userfiles/file/tidavimenax.pdfIn PDF document text
- http://thanuyentea.com/ckfinder/userfiles/files/10228343623.pdfIn PDF document text
- http://ssaisarang.com/ckfinder/userfiles/files/muxif.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=diskpart+cannot+create+primary+partition+on+sd+cardPDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000ef65.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEF65	10836 bytes
SHA-256: `9b4bcfb799e8ecdfecfc3a60ce83432881ce0bb9afe8f5904489b4a29922c7cc`
`font_01_sfnt_off00010879.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10879	17292 bytes
SHA-256: `a026e93321e5c5775e40660eae89a308d5f5075fc363365186b4f371957cf838`
`font_02_sfnt_off00013560.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13560	17340 bytes
SHA-256: `f2ed7a17ea4b9ded382a6156c5cfa122147622385093c1656179b6aa7711aaaf`
`font_03_sfnt_off00014ead.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14EAD	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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