PDF malware analysis — malicious · 09769bd4a628de75

MALICIOUS

PDF

92.2 KB Created: 2021-09-06 19:09:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 1d1cd5d4dde0dc365e96fb5392226ef5 SHA-1: cd22a3d2118d2dad9a58fa3cd6b72f41a009a97f SHA-256: 09769bd4a628de75c77618023bf1abf8da00d73b1b4f1824b64de8bf2389d81c

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the PDF structure itself are indicative of a phishing or malware distribution lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9970

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://inwebjor.ru/uplcv?utm_term=star+method+interview+questions+and+answers+pdf PDF link annotation
- https://unibel.pl/pliki/upload/file/11371086284.pdfIn PDF document text
- http://chingyi.tw/userfiles/files/sipusolulukubuluvop.pdfIn PDF document text
- http://fedime.org/imagenes/rowagu.pdfIn PDF document text
- http://aliceinformaticasrl.com/user/pages/simofowurokiwifox.pdfIn PDF document text
- http://a-kamen.com/userfiles/file/12221905545.pdfIn PDF document text
- https://upbilbao.com/ckfinder/userfiles/files/30881981266.pdfIn PDF document text
- https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b14122846e3---51701934982.pdfIn PDF document text
- http://www.bufolari.com/public/immagini/file/94655234005.pdfIn PDF document text
- http://manvilastrust-org.bvirani.com/ckfinder/userfiles/files/73442504524.pdfIn PDF document text
- https://lawyerupsmart.com/tempimg/file/4605226865.pdfIn PDF document text
- https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610d3e489c214---5696660500.pdfIn PDF document text
- http://seoulsquare.com/userfiles/file/73079358115.pdfIn PDF document text
- http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160dab53900b22---82288293169.pdfIn PDF document text
- https://o2opr.co/userfiles/files/wuvoxuxek.pdfIn PDF document text
- https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ca7b4260b---4225099769.pdfIn PDF document text
- http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608682b38f230---31075965551.pdfIn PDF document text
- http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc10a9a081---40578652298.pdfIn PDF document text
- https://khonggiansachhanoi.vn/uploads/files/61565399294.pdfIn PDF document text
- https://commonwealthsportsawards.com/userfiles/file/viwewokasutifinanu.pdfIn PDF document text
- http://j-line.ca/fck_upload/file/mobibawapunanarabiwegot.pdfIn PDF document text
- http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608305eb3f085---tuxanekarafekemewafewajub.pdfIn PDF document text
- http://cabinet-blin.fr/ressource/site-image/files/dunokisulupalepusegobad.pdfIn PDF document text
- https://autosaloncenter.com/uploads/file/juruxodefanebuxupasabiwu.pdfIn PDF document text
- https://afgventuregroup.com/cfiles/file/tedetabopewumilosizup.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_off0000ff32.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFF32	19132 bytes
SHA-256: `a8900b1c08545eb15e3d8a9aa690e08466862c79701fef133f59862bdeffd202`
`font_01_sfnt_off000130df.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x130DF	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000148f6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x148F6	11192 bytes
SHA-256: `2769c4e8fc258175ce96740a9f8e7510ab03af68b2ed3de13cb177a1ec7eeb11`

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