PDF malware analysis — malicious · 58e7c92cbc33574b

MALICIOUS

PDF

85.4 KB Created: 2021-07-07 03:00:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 2b767818fe6edb39304299c915f00ec1 SHA-1: 0997896c497076cdf1f222d958696bc3a91ffe9a SHA-256: 58e7c92cbc33574bbf2127de8e253a693b8cb9e3441d8878b13e6e576850dc4d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware delivery. No scripts were extracted, but the extensive use of external URLs points to an attempt to redirect the user to a compromised or malicious site.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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://inwebjor.ru/uplcv?utm_term=natural+vegetation+and+wildlife+answers PDF link annotation
- https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16089d839298e5---lepazifisajojizudibanoraj.pdfIn PDF document text
- http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee6ce78cc9---7129485474.pdfIn PDF document text
- http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/16942341209.pdfIn PDF document text
- https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/8921ed8dv06plvhrb6sm0lbtl8/dukarakanewebosar.pdfIn PDF document text
- https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/bf56f8ee2cb1e22d5afcb1c23f0cad09/32449133626.pdfIn PDF document text
- https://brod-plovdiv.com/images/47437242717.pdfIn PDF document text
- http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7e143d20f---47501874484.pdfIn PDF document text
- https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/6703222e7465d3b1baa018836d064922/11841772786.pdfIn PDF document text
- http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608073115c4b5---16436322940.pdfIn PDF document text
- https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160a170850d73a---3342042030.pdfIn PDF document text
- https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/3nmid1817r9eaod5iu8m9spocr/6861231309.pdfIn PDF document text
- http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609034d4b4a14---54384134021.pdfIn PDF document text
- http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/2e9f7cea753b07003d800dd204760fb7/88437491186.pdfIn PDF document text
- https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a6c055afc---82068821923.pdfIn PDF document text
- http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c886a7f247---15847022516.pdfIn PDF document text
- http://anhuishangbiao.com/upload_fck/file/2021-5-5/20210505214439769964.pdfIn PDF document text
- http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc5e956e63---junokedunovoxafibiz.pdfIn PDF document text
- http://www.alex-vasilkov.ru/images/wisdom/file/87325243247.pdfIn PDF document text
- http://arcdesantmarti.com/biocop/Images/images-editor/file/ramexika.pdfIn PDF document text
- http://location-venise.com/italie_documents/files/35418907544.pdfIn PDF document text
- https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/54a574cdafc619234825d2759cf36c37/57039633251.pdfIn PDF document text
- https://alakharia.com/public_html/userfiles/file/76528019661.pdfIn PDF document text
- https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/2939983fc84df232f5ed9d835ef181f8/16142895905.pdfIn PDF document text
- https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607642fe04ef9---pabizepenuxakewagebize.pdfIn PDF document text
- http://syuncyoku.jp/upload/file/wadenegosufotuluni.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_off0000ec57.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEC57	16504 bytes
SHA-256: `b99bd7f276ce91f91dd0c2b18be69349ff7fadddb4da979a1e31efa3440b9e7e`
`font_01_sfnt_off00011736.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11736	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012f4d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12F4D	10760 bytes
SHA-256: `6c54c4fe4b73836030af593e87706b5fbc8b65e8437adede7d57e64d01aae029`

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