PDF malware analysis — malicious · aa4f34b83398e9d0

MALICIOUS

PDF

77.5 KB Created: 2021-09-02 23:11:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02

MD5: f9722e837326b56fb6b465ad58b33441 SHA-1: 10c11be96076e3c3410811117a894f8e3e277ba2 SHA-256: aa4f34b83398e9d074edbd4324cbc2e809091c979185ed9c56eae527eed2695b

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

Nyx PDF Classifier malicious score 0.9908

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 http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/6344b244e1e45140e190d4bcc44dc1cc/falejelub.pdf In PDF document text
- http://xpressup.com/userfiles/file/61153351637.pdfIn PDF document text
- https://thefencedocumentary.com/adminfiles/file/97858799071.pdfIn PDF document text
- https://yarpaket.ru/userfiles/file/zavorepigemududafenilu.pdfIn PDF document text
- http://ambvetesopo.eu/userfiles/files/70530823565.pdfIn PDF document text
- https://www.campacinter.com/image/upload/File/96350079130.pdfIn PDF document text
- http://msslink.ru/userfiles/files/bevumetati.pdfIn PDF document text
- http://curry-box-deluxe.de/userfiles/file/65412869075.pdfIn PDF document text
- http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/40c12db6a2ccff40a56f82de8b302136/gejasudekilutipujakek.pdfIn PDF document text
- http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091fe8b4b0eb---86866819009.pdfIn PDF document text
- https://imagebeaute.fr/userfiles/file/4355073577.pdfIn PDF document text
- http://grapevinewinerytrail.com/clients/876125/File/wutevuterosaxibadarewi.pdfIn PDF document text
- http://curry-box-deluxe.de/userfiles/file/17263472556.pdfIn PDF document text
- https://zabulgaria.org/userfiles/file/97529608705.pdfIn PDF document text
- http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e65834ebf---80515951443.pdfIn PDF document text
- http://bg104558.agchost.com/userfiles/files/17696687164.pdfIn PDF document text
- http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161202eec05c38---fozavapizuzifam.pdfIn PDF document text
- https://mudraconsultancy.com/uploads/files/6947203584.pdfIn PDF document text
- https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/vro0n57d3l95o6n2f99mdve9qh/pusanuninar.pdfIn PDF document text
- http://flomojapan.com/upload/files/17709698192.pdfIn PDF document text
- https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b56adc43dc7---29070832839.pdfIn PDF document text
- http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2d6e9ce869---9086464044.pdfIn PDF document text
- http://ghibms.com/userfiles/files/60954195202.pdfIn PDF document text
- https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/239a447474c569c133f69c7fb7ea49e1/61558609912.pdfIn PDF document text
- http://slenderclub.cz/ckfinder/userfiles/files/1395492270.pdfIn PDF document text
- http://emmanuelmissionarybaptist.com/clients/74938/File/69964774552.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=the+road+not+taken+line+by+line+analysis+pdfPDF 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_off0000cc0f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCC0F	16832 bytes
SHA-256: `f7bbfc47f457f5ba5f9dd2c4874a65029bab9727db067ac1597932534c6739df`
`font_01_sfnt_off0000f6de.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF6DE	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010ef5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10EF5	10904 bytes
SHA-256: `bb3b55ea1245c8bed53a4d0b9c28c3275663ba0159863c0bfd0133fe3782ca26`

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