PDF malware analysis — malicious · c2b27b53a8eb324e

MALICIOUS

PDF

110.1 KB Created: 2021-07-05 02:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: a708fe4bf4d1c29e53ecb0413dd41f6c SHA-1: b2ce59c7b53f6c7b6476c1be48e724143abd9ad6 SHA-256: c2b27b53a8eb324ea4535b330b8818faf6ebae98c9f525dae1c4cd790474ae17

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure indicates a phishing or redirection attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9819

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 http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/ridsmjvpg0ml4it35h5cvvnks2/vugili.pdf In PDF document text
- https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/6d7b79ab647fda316712d86e68b87128/7080565710.pdfIn PDF document text
- http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a116d3867---49893395317.pdfIn PDF document text
- http://autoshiftbid.com/fckeditor/userfiles/file/pejojelulixutarebab.pdfIn PDF document text
- http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6d1bafd8d---63380354027.pdfIn PDF document text
- https://thefertilizergranulator.com/d/files/99132263159.pdfIn PDF document text
- https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aec6572852b---nonijuwoziwosi.pdfIn PDF document text
- http://tz5168.com/uploadfile/image/2021/05/16/file/20210516_023722_144.pdfIn PDF document text
- https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/c0fe24f1cc2e603ae882036df5273dc0/retusuvub.pdfIn PDF document text
- https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/35b99605f1e8073b6c65353ee11321bd/pojuriw.pdfIn PDF document text
- https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/64d94181db3f14f4a2fba2d9cfb04322/50728967540.pdfIn PDF document text
- https://shop-ecobati.com/medias/upload/files/34892186940.pdfIn PDF document text
- https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/taisa8gpttdie253irtkl50n8t/66282519012.pdfIn PDF document text
- http://ibtaker.ps/userfiles/file/21768612493.pdfIn PDF document text
- https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/4be5e6144d63e81b231671bd1b8b302d/27207462191.pdfIn PDF document text
- http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed0ee6199a---13698135195.pdfIn PDF document text
- http://quocteanviet.com/img-chamthi/files/79466682114.pdfIn PDF document text
- https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bda60b73fbe---77626462172.pdfIn PDF document text
- http://abacusnancy.com/userfiles/file/53341799908.pdfIn PDF document text
- https://yssnewlessons.org/UserFilesTwo/file/5482701509.pdfIn PDF document text
- https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/9115254412.pdfIn PDF document text
- https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/d54501f68fe7328da3802e3ec077a0cb/48536519378.pdfIn PDF document text
- https://machinex-machines.com/UserFiles/File/78656929203.pdfIn PDF document text
- http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16096fb550af15---77028055839.pdfIn PDF document text
- http://tmacfashion.com/ckfinder/userfiles/files/23538089205.pdfIn PDF document text
- http://brmhn.com/userfiles/file/20210516151610_rt9kfd.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=far+cry+4+unlock+all+weapons+trainerPDF 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_off00014c43.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14C43	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0001645a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1645A	10812 bytes
SHA-256: `5850cf7643872093b1f155073785e36697fb2c327cab197298d7635aa1eae533`
`font_02_sfnt_off00017d85.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x17D85	17268 bytes
SHA-256: `b49b3b0000f6846a756c498e9513a291a792e2a8c09d3d86c91c10a5cf53066a`

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