PDF malware analysis — malicious · af21d3985818ce51

MALICIOUS

PDF

75.5 KB Created: 2021-12-08 05:43:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-21

MD5: a024fddcafa88141d285c64a6ef618b7 SHA-1: 25c7691c7becf45ac421065f622b557c928dad84 SHA-256: af21d3985818ce514736e3523b2a5027447555794eb596b4c004f0b4bb35b6d8

156 Risk Score

Machine Learning

Nyx PDF Classifier malicious score 0.9985

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
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://chcial.ru/uplcv?utm_term=bogorodice+djevo+rachmaninoff+pdf PDF link annotation
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161a09eff99aa3---gulifurodofob.pdfIn PDF document text
- https://tonmathunglan.vn/upload/files/kaluwud.pdfIn PDF document text
- https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/85410169359.pdfIn PDF document text
- https://hchoanglong.vn/userfiles/file/86094978369.pdfIn PDF document text
- http://rockhouseschool.com/rockhouse/uploads/files/28163229149.pdfIn PDF document text
- http://smileorganic.net/smileorgfarm/filesupload/File/wapulimo.pdfIn PDF document text
- http://ampletrekking.com/userfiles/file/46919008840.pdfIn PDF document text
- https://www.chablis-gautherin.com/ckfinder/userfiles/files/vugamajodobewofukibesuf.pdfIn PDF document text
- http://www.terresdescaraibes.fr/file/26086655146.pdfIn PDF document text
- http://vas-vill.hu/userfiles/file/61050353606.pdfIn PDF document text
- http://bandenplaats.nl/cmsimages/file/laxilowikikazo.pdfIn PDF document text
- https://nissanzorba.ro/ckeditor/ckfinder/userfiles/files/fifebolafekifoxokobet.pdfIn PDF document text
- https://guijek.com/userfiles/file/wafegofoxil.pdfIn PDF document text
- https://dgssu.com/upfolder/e/files/20211018091118.pdfIn PDF document text
- https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1618db5dd20816---95198333699.pdfIn PDF document text
- https://casabresciani.it/uploads/file/17006837961.pdfIn PDF document text
- https://jjpremiers.com/files/niguvasokijanefu.pdfIn PDF document text
- https://performanshost.com/calisma2/files/uploads/85501112844.pdfIn PDF document text
- https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615a7227d8c05---vexexapopivalijawud.pdfIn PDF document text
- https://kubermatkaplay.com/ckfinder/userfiles/files/24877994576.pdfIn PDF document text
- http://autoneza.cz/UserFiles/File/98485637235.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_off0000b701.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB701	16416 bytes
SHA-256: `cfa2c3fbce80cc5607e01af033b793d17c57c214fb1d96e845eedea48cccd336`
`font_01_sfnt_off0000cda5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCDA5	11004 bytes
SHA-256: `dbe2ce316ab5d8a58549582ec32b89602b1aa8dbe5997ffc153bf4465edffc1e`
`font_02_sfnt_off0000e6cc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE6CC	22128 bytes
SHA-256: `a829d90d3d9cd690bc98cf965132e1374fa9fa3373e59e6b216a302240f58146`

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