PDF malware analysis — malicious · a60b9532c6d507f2

MALICIOUS

PDF

81.2 KB Created: 2021-09-04 14:12:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02

MD5: 600786067ac698898e0e9d7b7fd790d4 SHA-1: 72e438eaf7aacffbb6b83043c229bc14660adfc0 SHA-256: a60b9532c6d507f23e436697f26998d9b22cec1775452d63d2f2bdc76ec9773f

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content or phishing pages. The document body was unreadable, but the overall structure and URL analysis strongly indicate a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9917

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://medvor.ru/uplcv?utm_term=compress+pdf+online+free+below+300kb PDF link annotation
- https://technische-dokumentation-hoffmann.com/upload/files/tarebapefo.pdfIn PDF document text
- http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160729f3967e1f---64578124364.pdfIn PDF document text
- https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/hdori3im18nfifnqfco2ucvm50/92705550216.pdfIn PDF document text
- http://cuacuonnhanh.vn/Images_upload/files/jexirakipofanonugajekisoz.pdfIn PDF document text
- http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd329edeb4---binidodemukaraxexa.pdfIn PDF document text
- http://mofrantech.com/userfiles/file/najovesikajawisidixofot.pdfIn PDF document text
- http://jjmcp.jp/userfiles/Image/file/xutemuledova.pdfIn PDF document text
- https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/9up5sqajj25imetisdsmi3i82b/rimudop.pdfIn PDF document text
- https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/f7c38fd08bafb4e00f4a9685ccd4f2f5/70762696797.pdfIn PDF document text
- https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef8bb2e51b---82598803763.pdfIn PDF document text
- http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160d28099811c8---nudilasug.pdfIn PDF document text
- https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/65d28e2130f4e193588c1d2bb59ee68f/24108620698.pdfIn PDF document text
- https://balaji-technology.com/userfiles/file/baxog.pdfIn PDF document text
- http://elcampoeco.org/FCKeditor/file/majod.pdfIn PDF document text
- http://mariangelesorrico.com/galeria/files/somofovajobiwodepokuwur.pdfIn PDF document text
- https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf79bcb5b78---rapufapu.pdfIn PDF document text
- https://ever-progress.dacola.com/upload/files/7620618938.pdfIn PDF document text
- http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ludof.pdfIn PDF document text
- http://bocghebinhduong.com/media/ftp/file/tujedimepafu.pdfIn PDF document text
- http://ji-tien.com/userfiles/file/niseresumeluwafe.pdfIn PDF document text
- https://dermatologie-chamonix.com/userfiles/file/34349288867.pdfIn PDF document text
- https://latework.cz/soubory/11649238847.pdfIn PDF document text
- http://dynamicyunnan.com/ckfinder/userfiles/files/72632895300.pdfIn PDF document text
- https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/a13fe9cbfe1b0cb7755dbdf393c0c97a/zopiruwugimisoromil.pdfIn PDF document text
- https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a27d5c0dc9a---72003848955.pdfIn PDF document text
- http://lab4050.com/upload/editor/file/pizowamiko.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_off0000d707.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD707	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ef1e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEF1E	11040 bytes
SHA-256: `c5dee01af9bb6eb0aaf28fa04040e100e150c45565d4e6e72642ddd6df72dedc`
`font_02_sfnt_off00010898.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10898	17748 bytes
SHA-256: `f10a4136b639d602c4d2028496e1bcc3426524e6afd086d196d05f69f3820a7e`

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