PDF malware analysis — malicious · ec8a285dac77579e

MALICIOUS

PDF

87.0 KB Created: 2021-09-04 22:58:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: d3d92a7c2bf443868e99c14bccf2594d SHA-1: b26071fa63054334d541a1f798899a4278710a50 SHA-256: ec8a285dac77579e243a54f5e53dbb8ff0d6afcdce8e765b71915c35e1e7cb3d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and a high-confidence ML classifier. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure indicates a malicious intent to redirect users to external, untrusted resources.

Machine Learning

Nyx PDF Classifier malicious score 0.9905

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://gndpta.eu/news_objects/files/lisugiki.pdf In PDF document text
- https://giltmorestukko.hu/ckfinder/userfiles/files/20764486353.pdfIn PDF document text
- http://goldmustang.com/files/files/gemanozanin.pdfIn PDF document text
- http://stagnesreunion.com/clients/e/ed/ed16748122b3ff8ec97113314e0446c4/File/97793967409.pdfIn PDF document text
- https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2929a7c15---46214849348.pdfIn PDF document text
- https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/424092e6ebe6b0c09f44f869529c5518/2601177007.pdfIn PDF document text
- https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160947159a4b68---66202903287.pdfIn PDF document text
- http://zbigniewrodak.pl/galeria/file/98276173791.pdfIn PDF document text
- http://stonestudio.pl/files/upload/file/pumabonanoxefajoveki.pdfIn PDF document text
- https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16086ca89ca80d---80014847973.pdfIn PDF document text
- https://yocarbroker.com/upload/ckfinder/files/80270045493.pdfIn PDF document text
- http://botosani.ro/img/uploads/file/sozezolikotora.pdfIn PDF document text
- http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611bf9ebd27cf---87289127711.pdfIn PDF document text
- https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/f42f83745e755056946673e5a9ae3025/78619100862.pdfIn PDF document text
- http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c79271c820---titabomibomaxuxet.pdfIn PDF document text
- https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a463d19476---55498187640.pdfIn PDF document text
- http://vitanova-cattery.com/upload/file/tizir.pdfIn PDF document text
- https://ooobelkom.ru/ckfinder/userfiles/files/luwis.pdfIn PDF document text
- http://cesnek-vysocina.cz/UserFiles/File/58820901517.pdfIn PDF document text
- http://jedwines.com/cmsCart//upload/file/97481798642.pdfIn PDF document text
- http://beloit1962.com/clients/8/83/8368a4f838dea3176655029ae9e337da/File/73429589871.pdfIn PDF document text
- http://sourceit.ke/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/93135487158.pdfIn PDF document text
- https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/99a6b59f5715604ec88f1391b9efc5bf/62931662840.pdfIn PDF document text
- http://voszveszprem.hu/_user/file/sarexukalono.pdfIn PDF document text
- https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/u6goq4q8m2it675fiv3fflsf5h/75748897258.pdfIn PDF document text
- https://simon-daulte.com/ckfinder/userfiles/files/rudikodunavobareke.pdfIn PDF document text
- http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a49bb41bc2c---xulapida.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=language+acquisition+support+system+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_off0000ed98.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xED98	17660 bytes
SHA-256: `f20c70019ba222e8c09a9f1ae9d999a3c8a2584b6b7524fdc8a11eaf6ea53ef6`
`font_01_sfnt_off00011ba5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11BA5	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000133bc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x133BC	11236 bytes
SHA-256: `48a92f027ed868445b29b0f7bc89ca151feb69d538025000a61c77fd88296960`

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