PDF malware analysis — malicious · 5fee1f9489176398

MALICIOUS

PDF

82.8 KB Created: 2021-06-27 05:19:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: a9e68c4814c31115265bab8217f5d53d SHA-1: 2ffe203dba7110bfc48a85ca7e23b206c8c0dcf9 SHA-256: 5fee1f9489176398e420d2f5f5ca7a82fb221be9b497f81e9b21e1faeb90bce5

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the structure and embedded URLs are indicative of a malicious document designed to lure users to potentially harmful content.

Machine Learning

Nyx PDF Classifier malicious score 0.9960

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://birons.net/wp-content/plugins/super-forms/uploads/php/files/88608adb731cc9094fabfd7756b9d339/2364553760.pdf In PDF document text
- https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/fc6c88e0ee84917aa03106717a5a9e75/20234251312.pdfIn PDF document text
- https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6b67085c7---memewisedubada.pdfIn PDF document text
- https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbe3c6f979---lalofutuxutavu.pdfIn PDF document text
- https://baoholaodong24.com/userfiles/file/xagopipaputofesizixogivi.pdfIn PDF document text
- https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/254lv2i2tccs8hv0jc5qkeojt5/gakosimaxilibabumoj.pdfIn PDF document text
- http://kowel.com/ckfinder/userfiles/files/1623418171.pdfIn PDF document text
- http://amoy-art.com/Upload/file/12744646367.pdfIn PDF document text
- https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4c88110d39f87401cdafc919460f9f4b/wiwoxododomuwod.pdfIn PDF document text
- https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/1d9020aefa87d413a3c2164220ce89b5/kukudebefipizev.pdfIn PDF document text
- http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096bce7b83ed---7960827832.pdfIn PDF document text
- https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5546c904b---93349199098.pdfIn PDF document text
- http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/50eb449c64b1ad0ea2771df72a6927f8/49475051768.pdfIn PDF document text
- http://collegium-connect.nl/ckupload/files/93518425368.pdfIn PDF document text
- https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b629c09a414---37973351225.pdfIn PDF document text
- https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/o0p99q1u90ituoomq8580fvr4u/665100892.pdfIn PDF document text
- https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/a2778d42888483b8fce35673636f4f1d/konuvajoxawakazinuxa.pdfIn PDF document text
- https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c3ea5dea9---65302034529.pdfIn PDF document text
- https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/f4e104a2b40224f5ef11f32025d58bc0/nitajidibel.pdfIn PDF document text
- http://ahchala.com/img/file/dipinivapolevasemimekaral.pdfIn PDF document text
- https://amursvoidom.ru/media/files/71843841150.pdfIn PDF document text
- http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9aece20648---90505753515.pdfIn PDF document text
- https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070ebb0afcf1---14043573335.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=32f+to+cPDF 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_off0000e2de.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE2DE	17636 bytes
SHA-256: `ab5fbc2233c2950a5ff02d569e825945ca390e21940996bdac5151effc762bff`
`font_01_sfnt_off000110fa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x110FA	9720 bytes
SHA-256: `c628becfa1a829a39f445529bf5ab5777242e62b47b35d56b0551905bf5e6c08`
`font_02_sfnt_off0001265c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1265C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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