PDF malware analysis — malicious · 314a0449acc46d21

MALICIOUS

PDF

89.2 KB Created: 2021-07-06 22:31:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25

MD5: f6f5212df87dd534730ed7a30a8d74f5 SHA-1: 40d38d21c041fd0491b6ee2c5010922858947d33 SHA-256: 314a0449acc46d21d3bfeff77cfd6369d3f4b3c20978a8d42aa70cedcd3c5d2a

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised CMS upload directories, suggesting an attempt to lure users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9822

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/4f0e3283dcc0a9882ebd9e3686ce186b/90769761816.pdf In PDF document text
- https://sahodayabbsr.com/test/fckeditor/file/gimiwinafekuzinuwujumuxof.pdfIn PDF document text
- http://musorcentrum.hu/files/article/file/93471395305.pdfIn PDF document text
- http://kartywspomnien.pl/uploads/assets/file/kolimurimugedamixisijafi.pdfIn PDF document text
- http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1606f29a411dd2---41392182082.pdfIn PDF document text
- https://arte-salon.ru/upload_picture/9473265500.pdfIn PDF document text
- https://balbok.net/admin/ckfinder/userfiles/files/5332690617.pdfIn PDF document text
- https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/dk1jthisl0otr4m35gap5qkqn7/32098471790.pdfIn PDF document text
- http://drwatsonsr.com/clients/2/2b/2b9a0cf27321ceab3a47fbd10bf94d34/File/parukafidilez.pdfIn PDF document text
- https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/f8321a95859ae0eb099879119409b4ac/16590621386.pdfIn PDF document text
- https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a649fa3e296---jotumedejuzetikixitir.pdfIn PDF document text
- https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/kkigno6puoo80tbc5lni1ivj17/36574009887.pdfIn PDF document text
- http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608da38298883---voxamusedavemuxab.pdfIn PDF document text
- https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cffe272d3d---lipuvugap.pdfIn PDF document text
- http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/c20b74c1bc19b6dc87060f8b6febf234/zexali.pdfIn PDF document text
- https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/d63fe10158afd1f607469f5e4c7eaafc/vumaxevezuvewowuvapif.pdfIn PDF document text
- https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/096fcf9fff1ada0d68abaeb97abfd853/99940535230.pdfIn PDF document text
- https://x-software.cz/data/file/mukizaz.pdfIn PDF document text
- https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/a9e78a6b1fd51674ec32c055c3bc9bd2/31886451166.pdfIn PDF document text
- https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/8f6406344479c0daacbf5f6024e546a1/36592520573.pdfIn PDF document text
- https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094a6ce577bd---23887809570.pdfIn PDF document text
- https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acbb8919361---pipuma.pdfIn PDF document text
- https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/a3ag17r48p4h8fm8gu2b01b70f/67524677801.pdfIn PDF document text
- http://ahchala.com/img/file/20408384066.pdfIn PDF document text
- http://myucpb.net/userfiles/file/xilamikewamo.pdfIn PDF document text
- http://iltorg.ru/upload/file/61356975499.pdfIn PDF document text
- http://markone-tools.com/upload/files/42731765270.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=greek+meaning+of+humblePDF 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_off0000f4f3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF4F3	10764 bytes
SHA-256: `37b2a41aa5563bf5b2e293884c187242dc6bdb224f168f92143a5b673577d971`
`font_01_sfnt_off00010d76.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10D76	19496 bytes
SHA-256: `eda31d3472560060cae8d60fcfaa7b16d0ecd3121cd8d1868a14abfd71ae6765`
`font_02_sfnt_off00013f5c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13F5C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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