PDF malware analysis — malicious · 46f0c1458a4df5e6

MALICIOUS

PDF

80.8 KB Created: 2021-06-29 02:04:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: 4f38f72d29018efa2b084ece8beeb1ea SHA-1: cd72ff1c8a2f2918fb0f2619985dc2542c072a1f SHA-256: 46f0c1458a4df5e6bc36420389cc0df0976693485f4d0bce4d89b7d2f78dc7f1

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and phishing-related. It contains a large number of external links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The presence of embedded URLs and the nature of the heuristics indicate a likely attempt to redirect users to malicious or phishing content, potentially for SEO poisoning or credential harvesting.

Machine Learning

Nyx PDF Classifier malicious score 0.9956

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://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/r41ftr5rvs9htiobe7uv6p4aqt/67599517580.pdf In PDF document text
- https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/ee2a7bd45cf7e58510a7086d6defb5c6/11980467430.pdfIn PDF document text
- http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/ct2i5f585rufvf130i3rega6n6/15390562136.pdfIn PDF document text
- https://senhewood.com/d/files/zivigagelusenodifisulofa.pdfIn PDF document text
- https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/ebef4f06cd21f4362c8e8b0da06f87c6/tezoguvusalosew.pdfIn PDF document text
- http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16073b9a62aa69---4428845164.pdfIn PDF document text
- https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/hnhdigjeeh561p63nh74t2mpir/verir.pdfIn PDF document text
- https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/f97utj7927u5krbglpq07hea65/nexejuxuwus.pdfIn PDF document text
- http://garmagostaran.com/Upload/file/migavexo.pdfIn PDF document text
- http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d128ba142---43236275505.pdfIn PDF document text
- https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16088047020852---rimus.pdfIn PDF document text
- https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/6e8em7ppi7f9i9d8mvqt37irjv/7028746250.pdfIn PDF document text
- https://grandplaza.bg/uploads/assets/file/16939595142.pdfIn PDF document text
- https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/pk6tod3a7opjq2s8n41p4nu909/61304625397.pdfIn PDF document text
- https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c9e335195---35325261871.pdfIn PDF document text
- https://journeywithmypet.com/ckfinder/userfiles/files/5118811125.pdfIn PDF document text
- https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/a50b4316c6add5e47cddd00f25e92bad/98798126242.pdfIn PDF document text
- https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f874f4c597---76883228164.pdfIn PDF document text
- http://danies.ru/ckfinder/userfiles/files/fifevujesesifafurepozip.pdfIn PDF document text
- https://ahreco.com/uploads/news_file/43020899051.pdfIn PDF document text
- https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/4klvn2k3b7md6fnvfilhb3vtc9/pomivirijaja.pdfIn PDF document text
- https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/dhgmrk5621hreimt71uj6dst08/lonuzivegutisajapezota.pdfIn PDF document text
- https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/dls162hsufv5v7ps1v058pjjgc/wibofozodusozu.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=homeopathy+medicine+for+pinwormsPDF 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_off0000d6d4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD6D4	11028 bytes
SHA-256: `5794bfb0762c04ee263ba5709c39054b34eea135c2c015b8733379b4651a881f`
`font_01_sfnt_off0000f053.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF053	16784 bytes
SHA-256: `ac76d827f13cb1228fee19d75294af5bd5a691f846c1d1eac9f76d980e098bce`
`font_02_sfnt_off00011c10.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11C10	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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